CHANGELOG.md

# Change Log

All notable changes to the Pony compiler and standard library will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/) and [Keep a CHANGELOG](http://keepachangelog.com/).

## [unreleased] - unreleased

### Fixed


### Added


### Changed


## [0.76.0] - 2026-10-14

### Fixed

- Fix release build link failure when building with GCC ([PR #6277](https://github.com/ponylang/ponyc/pull/6277))
- Fix I128 constant division by -1 producing wrong result ([PR #6282](https://github.com/ponylang/ponyc/pull/6282))
- Fix backpressure muting cascade ([PR #6285](https://github.com/ponylang/ponyc/pull/6285))

### Changed

- Split Seq into ReadSeq, Seq, and ResizableSeq ([PR #6275](https://github.com/ponylang/ponyc/pull/6275))
- Remove compile-time error for constant integer division by zero ([PR #6280](https://github.com/ponylang/ponyc/pull/6280))

## [0.75.0] - 2026-10-11

### Fixed

- Fix getsockopt_u32 failing on platforms that return sub-4-byte socket options ([PR #6229](https://github.com/ponylang/ponyc/pull/6229))
- Fix wrong error codes for socket operations on Windows ([PR #6231](https://github.com/ponylang/ponyc/pull/6231))
- Fix socket option calls failing with WSAEINVAL on Windows ([PR #6236](https://github.com/ponylang/ponyc/pull/6236))
- Fix subtype cache doing unnecessary work on every subtype check ([PR #6243](https://github.com/ponylang/ponyc/pull/6243))
- Speed up the reach pass with method-name pre-filtering ([PR #6247](https://github.com/ponylang/ponyc/pull/6247))
- Fix compilation failure when LLVM detects a CPU name invalid for the target ([PR #6252](https://github.com/ponylang/ponyc/pull/6252))
- Fix --thin-lto crash ([PR #6261](https://github.com/ponylang/ponyc/pull/6261))
- Fix linking Pony programs on openSUSE Tumbleweed ([PR #6266](https://github.com/ponylang/ponyc/pull/6266))

### Added

- Add guarded devirtualization for multi-subtype interface dispatch ([PR #6217](https://github.com/ponylang/ponyc/pull/6217))
- Add multi-failure reporting to PonyCheck ([PR #6215](https://github.com/ponylang/ponyc/pull/6215))
- Add multicast convenience methods to UDPSocket ([PR #6220](https://github.com/ponylang/ponyc/pull/6220))
- Add \inline\, \inline(N)\, and \noinline\ annotations ([PR #6221](https://github.com/ponylang/ponyc/pull/6221))
- Add targeted testing to PonyCheck ([PR #6224](https://github.com/ponylang/ponyc/pull/6224))
- Add connected UDP mode ([PR #6227](https://github.com/ponylang/ponyc/pull/6227))
- Add iftype specialization for method overloading on type parameters ([PR #6222](https://github.com/ponylang/ponyc/pull/6222))
- Add darkmode toggle to pony-doc generated documentation ([PR #6239](https://github.com/ponylang/ponyc/pull/6239))
- Add pony-agent-server ([PR #6264](https://github.com/ponylang/ponyc/pull/6264))

### Changed

- Make HashFn.apply partial so callers can detect OpenSSL failure ([PR #6213](https://github.com/ponylang/ponyc/pull/6213))
- Collection clone methods return iso when element types are val ([PR #6237](https://github.com/ponylang/ponyc/pull/6237))
- Update to LLVM 23.1.3 ([PR #6270](https://github.com/ponylang/ponyc/pull/6270))

## [0.74.0] - 2026-09-30

### Fixed

- Fix ARM64 Windows LTO crash caused by MSVC miscompilation of LLVM ([PR #6189](https://github.com/ponylang/ponyc/pull/6189))
- Fix compiling with runtime tracing on the BSDs ([PR #6192](https://github.com/ponylang/ponyc/pull/6192))
- Fix compiling with runtime tracing on RISC-V ([PR #6194](https://github.com/ponylang/ponyc/pull/6194))
- Fix property test failures not triggering shrinking ([PR #6171](https://github.com/ponylang/ponyc/pull/6171))
- Fix type argument inference through intermediate traits ([PR #6202](https://github.com/ponylang/ponyc/pull/6202))
- Fix assert_no_error returning true on failure ([PR #6204](https://github.com/ponylang/ponyc/pull/6204))
- Fix classification percentages skewed by regression replay ([PR #6205](https://github.com/ponylang/ponyc/pull/6205))
- Fix malformed documentation for constructors with generic-typed default values ([PR #6210](https://github.com/ponylang/ponyc/pull/6210))
- Fix multiple for_all calls sharing first property's timeout ([PR #6211](https://github.com/ponylang/ponyc/pull/6211))

### Added

- Add pluggable test result reporting ([PR #6206](https://github.com/ponylang/ponyc/pull/6206))

### Changed

- Build vendored LLVM libraries with clang-cl on ARM64 Windows ([PR #6189](https://github.com/ponylang/ponyc/pull/6189))
- Merge property testing into PonyTest ([PR #6171](https://github.com/ponylang/ponyc/pull/6171))
- Update to LLVM 23.1.2 ([PR #6168](https://github.com/ponylang/ponyc/pull/6168))
- Reject runtime-reserved signals in HandleableSignalValidator ([PR #6188](https://github.com/ponylang/ponyc/pull/6188))
- Distinguish rejected commands from SUT failures in StatefulProperty.step() ([PR #6203](https://github.com/ponylang/ponyc/pull/6203))
- Make Randomness draw methods non-partial ([PR #6203](https://github.com/ponylang/ponyc/pull/6203))

## [0.73.0] - 2026-09-27

### Fixed

- Fix out-of-memory when compiling large programs on 32-bit platforms ([PR #6109](https://github.com/ponylang/ponyc/pull/6109))
- Fix debug info generation so release builds no longer need to strip DWARF data ([PR #6109](https://github.com/ponylang/ponyc/pull/6109))
- Bound PonyTest concurrent execution to scheduler thread count ([PR #6072](https://github.com/ponylang/ponyc/pull/6072))
- Fix cycle detector memory leak for mutually-referencing actors ([PR #6099](https://github.com/ponylang/ponyc/pull/6099))
- Fix out-of-memory crash on ILP32 Linux from address space fragmentation ([PR #6111](https://github.com/ponylang/ponyc/pull/6111))
- Fix unnecessary per-byte allocation in ToHexString ([PR #6119](https://github.com/ponylang/ponyc/pull/6119))
- ConstantTimeCompare now uses OpenSSL's CRYPTO_memcmp ([PR #6120](https://github.com/ponylang/ponyc/pull/6120))
- Fix Reader crash when appending empty data ([PR #5945](https://github.com/ponylang/ponyc/pull/5945))
- Improve error message when writing to a field in an immutable method ([PR #6123](https://github.com/ponylang/ponyc/pull/6123))
- Fix error message for nested field writes in immutable methods ([PR #6125](https://github.com/ponylang/ponyc/pull/6125))
- Fix File losing data on large writes ([PR #6124](https://github.com/ponylang/ponyc/pull/6124))
- Improve error messages for method lookup on anonymous types ([PR #6127](https://github.com/ponylang/ponyc/pull/6127))
- Fix runtime bitcode performance ([PR #6133](https://github.com/ponylang/ponyc/pull/6133))
- Inline `pony_alloc` and `pony_alloc_small` calls that HeapToStack does not promote ([PR #6133](https://github.com/ponylang/ponyc/pull/6133))
- Export PONY_API symbols on ELF platforms when runtime bitcode is merged ([PR #6146](https://github.com/ponylang/ponyc/pull/6146))
- Fix optimizer attributes lost after runtime linking ([PR #6148](https://github.com/ponylang/ponyc/pull/6148))
- Fix String.copy_cpointer reading one byte past the source buffer ([PR #6158](https://github.com/ponylang/ponyc/pull/6158))
- Fix property test failures not triggering shrinking ([PR #6171](https://github.com/ponylang/ponyc/pull/6171))

### Added

- Add \by_value\ FFI annotation for struct-by-value passing ([PR #6062](https://github.com/ponylang/ponyc/pull/6062))
- Add `--lib-path` / `-L` flag for extra linker library search paths ([PR #6084](https://github.com/ponylang/ponyc/pull/6084))
- Add `is_socket_connected` to `TCPBackend` trait ([PR #6094](https://github.com/ponylang/ponyc/pull/6094))
- Add Generators.f32 and Generators.f64 to PonyTest ([PR #6103](https://github.com/ponylang/ponyc/pull/6103))
- Add classification API to PonyTest ([PR #6107](https://github.com/ponylang/ponyc/pull/6107))
- Add crypto package to the standard library ([PR #6114](https://github.com/ponylang/ponyc/pull/6114))
- Add stateful property testing to PonyTest ([PR #6121](https://github.com/ponylang/ponyc/pull/6121))
- Add health check warnings to PonyTest ([PR #6128](https://github.com/ponylang/ponyc/pull/6128))
- Add inacc_or_arg_mem to pony_send_done and pony_recv_done ([PR #6150](https://github.com/ponylang/ponyc/pull/6150))
- Add regression persistence to PonyTest ([PR #6154](https://github.com/ponylang/ponyc/pull/6154))
- Optimize constant val array literals ([PR #6177](https://github.com/ponylang/ponyc/pull/6177))
- Runtime tracing flags available in all builds ([PR #6182](https://github.com/ponylang/ponyc/pull/6182))

### Changed

- Merge property testing into PonyTest ([PR #6171](https://github.com/ponylang/ponyc/pull/6171))
- `--print_stats` no longer reports heap-to-stack promotion counts ([PR #6109](https://github.com/ponylang/ponyc/pull/6109))
- Release builds no longer strip debug info automatically ([PR #6109](https://github.com/ponylang/ponyc/pull/6109))
- Remove `--extfun` flag ([PR #6109](https://github.com/ponylang/ponyc/pull/6109))
- Replace optimize-then-emit pipeline with per-package codegen ([PR #6109](https://github.com/ponylang/ponyc/pull/6109))
- Remove `--pass asm` and `--pass obj` ([PR #6109](https://github.com/ponylang/ponyc/pull/6109))
- Add AsioBackend trait for mockable ASIO operations ([PR #6071](https://github.com/ponylang/ponyc/pull/6071))
- `TCPBackend` implementations must add `is_socket_connected` ([PR #6094](https://github.com/ponylang/ponyc/pull/6094))
- `HashSet` no longer provides `is Comparable` ([PR #6122](https://github.com/ponylang/ponyc/pull/6122))
- persistent `HashSet` no longer provides `is Comparable` ([PR #6122](https://github.com/ponylang/ponyc/pull/6122))
- `Flags` no longer provides `is Comparable` ([PR #6122](https://github.com/ponylang/ponyc/pull/6122))
- Remove DTrace and SystemTap support ([PR #6136](https://github.com/ponylang/ponyc/pull/6136))
- Make runtime bitcode the default on clang-based platforms ([PR #6137](https://github.com/ponylang/ponyc/pull/6137))
- Remove `--runtimebc` CLI flag ([PR #6137](https://github.com/ponylang/ponyc/pull/6137))
- macOS shared libraries must use `-undefined dynamic_lookup` instead of linking `libponyrt` ([PR #6137](https://github.com/ponylang/ponyc/pull/6137))
- Make runtime bitcode the default ([PR #6137](https://github.com/ponylang/ponyc/pull/6137))
- Remove `runtime_tracing` build option ([PR #6182](https://github.com/ponylang/ponyc/pull/6182))

## [0.72.1] - 2026-09-13

### Fixed

- Fix TCP backpressure stalls on BSDs ([PR #6037](https://github.com/ponylang/ponyc/pull/6037))

### Added

- Add uri package to the standard library ([PR #6034](https://github.com/ponylang/ponyc/pull/6034))
- Add http_client package to the standard library ([PR #6034](https://github.com/ponylang/ponyc/pull/6034))

## [0.72.0] - 2026-09-11

### Fixed

- Speed up the reachability pass on large programs ([PR #6025](https://github.com/ponylang/ponyc/pull/6025))

### Added

- Time the reach and paint passes with --pass-timings ([PR #6022](https://github.com/ponylang/ponyc/pull/6022))

### Changed

- Replace stdlib net package with ponylang/lori ([PR #6016](https://github.com/ponylang/ponyc/pull/6016))
- Change TCPBackend.connect to return Array[AsioEventID] ([PR #6016](https://github.com/ponylang/ponyc/pull/6016))

## [0.71.0] - 2026-09-07

### Fixed

- Fix iftype capability narrowing inside generic return types ([PR #5994](https://github.com/ponylang/ponyc/pull/5994))

### Changed

- Make terminal raw mode opt-in and auth-gated ([PR #5990](https://github.com/ponylang/ponyc/pull/5990))
- PonyCheck: choice-sequence-based internal shrinking ([PR #5995](https://github.com/ponylang/ponyc/pull/5995))

## [0.70.1] - 2026-09-05

### Fixed

- Fix type argument inference for consumed arguments ([PR #5984](https://github.com/ponylang/ponyc/pull/5984))
- Fix lambda parameter type inference regression ([PR #5983](https://github.com/ponylang/ponyc/pull/5983))
- Fix compiler crash on unresolved type names in object literal bodies ([PR #5985](https://github.com/ponylang/ponyc/pull/5985))
- Fix type argument constraint check rejecting capability subtypes ([PR #5989](https://github.com/ponylang/ponyc/pull/5989))
- Fix PonyCheck set and map generators to guarantee requested element counts ([PR #5987](https://github.com/ponylang/ponyc/pull/5987))

### Added

- Add PonyCheck generators for persistent collections ([PR #5980](https://github.com/ponylang/ponyc/pull/5980))

## [0.70.0] - 2026-09-04

### Fixed

- Fix false "declaration appears after use" error with trait default method bodies ([PR #5857](https://github.com/ponylang/ponyc/pull/5857))
- Fix false "this pattern can never match" error for a type parameter inside a type argument ([PR #5858](https://github.com/ponylang/ponyc/pull/5858))
- Fix false "this pattern can never match" error for a type parameter inside a trait or interface type argument ([PR #5861](https://github.com/ponylang/ponyc/pull/5861))
- Fix false "this pattern can never match" error for constraint-overlapping type parameters and union, intersection, or tuple type arguments ([PR #5866](https://github.com/ponylang/ponyc/pull/5866))
- Fix `Vec.slice` and `Vec.reverse` in `collections/persistent` ([PR #5856](https://github.com/ponylang/ponyc/pull/5856))
- Fix false unreachable match for structural interface patterns ([PR #5872](https://github.com/ponylang/ponyc/pull/5872))
- Fix false unreachable match for structural interface patterns with lambda parameters ([PR #5881](https://github.com/ponylang/ponyc/pull/5881))
- Fix deferred stdout output on Windows ([PR #5885](https://github.com/ponylang/ponyc/pull/5885))
- Fix false "unreachable code" error when all branches jump away in a None-returning function ([PR #5887](https://github.com/ponylang/ponyc/pull/5887))
- Fix `repeat` loop field initialization tracking with `break` ([PR #5888](https://github.com/ponylang/ponyc/pull/5888))
- Fix crash when compiling with --runtimebc ([PR #5889](https://github.com/ponylang/ponyc/pull/5889))
- Fix compiler crash from return inside resolved iftype branch ([PR #5890](https://github.com/ponylang/ponyc/pull/5890))
- Fix overly strict consumed-variable check in try/else blocks ([PR #5891](https://github.com/ponylang/ponyc/pull/5891))
- Fix destructuring assignment for unions of same-arity tuples ([PR #5892](https://github.com/ponylang/ponyc/pull/5892))
- Fix `style/blank-lines` false positive on block comments between declarations ([PR #5895](https://github.com/ponylang/ponyc/pull/5895))
- Fix persistent Map iterators reporting items on an empty map ([PR #5877](https://github.com/ponylang/ponyc/pull/5877))
- Fix persistent Map removing the wrong entry for a key it doesn't contain ([PR #5877](https://github.com/ponylang/ponyc/pull/5877))
- Fix data loss in collections/persistent Vec.remove ([PR #5903](https://github.com/ponylang/ponyc/pull/5903))
- Fix object literal compilation with union-constrained type parameters ([PR #5905](https://github.com/ponylang/ponyc/pull/5905))
- Fix iftype narrowing for methods that use `this->` viewpoint ([PR #5907](https://github.com/ponylang/ponyc/pull/5907))
- Fix tuple subtyping for tuples with tag elements ([PR #5900](https://github.com/ponylang/ponyc/pull/5900))
- Fix compiler accepting `?` functions whose only error source is self-recursion ([PR #5911](https://github.com/ponylang/ponyc/pull/5911))
- Fix wrapping division of signed minimum value by -1 ([PR #5918](https://github.com/ponylang/ponyc/pull/5918))
- Fix I128 and U128 divrem_unsafe on native128 platforms ([PR #5922](https://github.com/ponylang/ponyc/pull/5922))
- Fix incorrect `#read->trn` viewpoint adaptation bounds ([PR #5925](https://github.com/ponylang/ponyc/pull/5925))
- Fix stack overflow (SEGV) in persistent List from unbounded recursion ([PR #5909](https://github.com/ponylang/ponyc/pull/5909))
- Fix incorrect viewpoint adaptation bounds for generic capability parameters ([PR #5933](https://github.com/ponylang/ponyc/pull/5933))
- Fix pony-doc displaying default parameter values ([PR #5935](https://github.com/ponylang/ponyc/pull/5935))
- Fix incorrect rounding of float literals near the extremes of F64's range ([PR #5937](https://github.com/ponylang/ponyc/pull/5937))
- Fix lambda type inference failure with generic #share constraints ([PR #5938](https://github.com/ponylang/ponyc/pull/5938))
- Fix overly conservative viewpoint adaptation bounds for ephemeral generic capabilities ([PR #5939](https://github.com/ponylang/ponyc/pull/5939))
- Fix soundness bug with aliased type parameter constraints ([PR #5941](https://github.com/ponylang/ponyc/pull/5941))
- Fix lambda capture types for fields accessed through non-ref receivers ([PR #5942](https://github.com/ponylang/ponyc/pull/5942))
- Fix iftype branches not satisfying type parameter return types ([PR #5944](https://github.com/ponylang/ponyc/pull/5944))
- Fix misleading error for bare lambda captures in tag methods ([PR #5948](https://github.com/ponylang/ponyc/pull/5948))
- Fix compiler crash when instantiating a generic with a union type argument that calls a constructor ([PR #5949](https://github.com/ponylang/ponyc/pull/5949))
- Fix lambda and object literal captures inside iftype bodies losing type parameter narrowing ([PR #5950](https://github.com/ponylang/ponyc/pull/5950))
- Fix compiler crash on array literals passed by name or to a call on a literal ([PR #5959](https://github.com/ponylang/ponyc/pull/5959))
- Fix PropertyRunner double completion on assert-and-error ([PR #5932](https://github.com/ponylang/ponyc/pull/5932))
- Fix stack overflow in itertools Iter methods ([PR #5936](https://github.com/ponylang/ponyc/pull/5936))
- Fix compiler crash on `is` with a constructor call ([PR #5964](https://github.com/ponylang/ponyc/pull/5964))
- Fix type parameter defaults that refer to an earlier type parameter ([PR #5967](https://github.com/ponylang/ponyc/pull/5967))
- Fix compiler crash on a lambda type used as a type parameter default ([PR #5967](https://github.com/ponylang/ponyc/pull/5967))
- Fix compiler crash on a type parameter default naming itself or a later one ([PR #5967](https://github.com/ponylang/ponyc/pull/5967))
- Fix the capability of a partially applied constructor ([PR #5965](https://github.com/ponylang/ponyc/pull/5965))
- Fix compiler crash on generic calls in runtime_override_defaults ([PR #5968](https://github.com/ponylang/ponyc/pull/5968))
- Fix partial application of generic constructors ([PR #5970](https://github.com/ponylang/ponyc/pull/5970))
- Fix type parameters constrained by other type parameters ([PR #5972](https://github.com/ponylang/ponyc/pull/5972))
- Fix segfault in programs with finalizers compiled with --runtimebc ([PR #5975](https://github.com/ponylang/ponyc/pull/5975))

### Added

- Add min parameter to PonyCheck set and map generators ([PR #5973](https://github.com/ponylang/ponyc/pull/5973))
- Add --pass-timings/--pass-timings-json for profiling compiler pass times ([PR #5792](https://github.com/ponylang/ponyc/pull/5792))
- Add multi-iterator for loop sugar ([PR #5896](https://github.com/ponylang/ponyc/pull/5896))
- Add `\c_api\` annotation for C-ABI interop ([PR #5898](https://github.com/ponylang/ponyc/pull/5898))
- Single-subtype devirtualization for interface/trait dispatch ([PR #5901](https://github.com/ponylang/ponyc/pull/5901))
- Improve heap-to-stack promotion for stored objects ([PR #5906](https://github.com/ponylang/ponyc/pull/5906))
- Add generic type argument inference for method and constructor calls ([PR #5974](https://github.com/ponylang/ponyc/pull/5974))

### Changed

- Change PonyCheck set and map generator parameter order from `(gen, max)` to `(gen, min, max)` ([PR #5973](https://github.com/ponylang/ponyc/pull/5973))
- Type parameter constraints now respect the default cap of the named type ([PR #5886](https://github.com/ponylang/ponyc/pull/5886))
- Applying a capability to a tuple type alias is a compile error ([PR #5900](https://github.com/ponylang/ponyc/pull/5900))
- Don't box machine words smaller than 64 bits ([PR #5952](https://github.com/ponylang/ponyc/pull/5952))
- Reject unreachable type annotations with self-referencing defaults ([PR #5967](https://github.com/ponylang/ponyc/pull/5967))
- Rename PonyCheck generator range parameters from min/max to from/to ([PR #5979](https://github.com/ponylang/ponyc/pull/5979))

## [0.69.1] - 2026-08-21

### Fixed

- Fix default type arguments failing to resolve with aliased use packages ([PR #5854](https://github.com/ponylang/ponyc/pull/5854))

## [0.69.0] - 2026-08-21

### Fixed

- Fix potential use-after-free on Windows during socket teardown ([PR #5805](https://github.com/ponylang/ponyc/pull/5805))
- Fix pony-lint running out of memory on repos with many packages ([PR #5809](https://github.com/ponylang/ponyc/pull/5809))
- Readline preserves the in-progress line when browsing history ([PR #5816](https://github.com/ponylang/ponyc/pull/5816))
- Fix slow stdin reads from redirected files on Windows ([PR #5815](https://github.com/ponylang/ponyc/pull/5815))
- Report a process's exit even when its pipes stay open ([PR #5770](https://github.com/ponylang/ponyc/pull/5770))
- ProcessMonitor.dispose no longer risks signaling an unrelated process ([PR #5770](https://github.com/ponylang/ponyc/pull/5770))
- ProcessMonitor no longer leaks file descriptors when a process fails to start ([PR #5770](https://github.com/ponylang/ponyc/pull/5770))
- Fix FilePath.from allowing paths outside the base directory ([PR #5821](https://github.com/ponylang/ponyc/pull/5821))
- Fix trait default method bodies failing to compile with aliased use packages ([PR #5824](https://github.com/ponylang/ponyc/pull/5824))
- Fix TCP and UDP sockets being closed when the system runs low on socket buffers ([PR #5823](https://github.com/ponylang/ponyc/pull/5823))
- Fix compiler crash when combining traits with abstract and default method ([PR #5827](https://github.com/ponylang/ponyc/pull/5827))
- Fix stdin end-of-input and error handling ([PR #5832](https://github.com/ponylang/ponyc/pull/5832))
- Fix compiler crash with multiple traits sharing a method with a default body ([PR #5831](https://github.com/ponylang/ponyc/pull/5831))
- Fix pony-lint false positive on identifiers with multiple trailing primes ([PR #5849](https://github.com/ponylang/ponyc/pull/5849))
- Fix pony-lint false positive on partial operators ([PR #5850](https://github.com/ponylang/ponyc/pull/5850))
- Fix Timer.abs computing wrong expiration time ([PR #5851](https://github.com/ponylang/ponyc/pull/5851))
- Fix stale version and git hash in local rebuilds ([PR #5852](https://github.com/ponylang/ponyc/pull/5852))

### Added

- Add the --ponymemoryprofile runtime option ([PR #5768](https://github.com/ponylang/ponyc/pull/5768))
- Add a streaming JSON parser ([PR #5658](https://github.com/ponylang/ponyc/pull/5658))
- Add the style/testlist-nodoc pony-lint rule ([PR #5830](https://github.com/ponylang/ponyc/pull/5830))

### Changed

- Replace the runtime allocator ([PR #5768](https://github.com/ponylang/ponyc/pull/5768))
- Change how scheduler scaling works ([PR #5768](https://github.com/ponylang/ponyc/pull/5768))
- Change JSONTokenParser to carry values on its tokens ([PR #5658](https://github.com/ponylang/ponyc/pull/5658))
- Starting a process returns a result ([PR #5770](https://github.com/ponylang/ponyc/pull/5770))
- ProcessMonitor requires Linux 5.3 or newer ([PR #5770](https://github.com/ponylang/ponyc/pull/5770))
- Add read_failed to InputNotify ([PR #5832](https://github.com/ponylang/ponyc/pull/5832))
- Exempt triple-quoted string literals from the 80-column lint rule ([PR #5837](https://github.com/ponylang/ponyc/pull/5837))
- pony-lint line-length rule narrows unbreakable-word exemption ([PR #5847](https://github.com/ponylang/ponyc/pull/5847))
- pony-lint: binary operators on continuation lines must now be at the end of the previous line ([PR #5851](https://github.com/ponylang/ponyc/pull/5851))
- pony-lint: `- expr` with a space at the start of a line is now a lint error ([PR #5851](https://github.com/ponylang/ponyc/pull/5851))
- Rename Json prefix to JSON in the json package ([PR #5848](https://github.com/ponylang/ponyc/pull/5848))
- Rename ForAll constructor parameter from testHelper to test_helper ([PR #5848](https://github.com/ponylang/ponyc/pull/5848))

## [0.68.0] - 2026-08-01

### Fixed

- Fix Windows programs never finishing when stdin has ended ([PR #5740](https://github.com/ponylang/ponyc/pull/5740))
- Fix Windows programs stalling while reading stdin from a pipe ([PR #5747](https://github.com/ponylang/ponyc/pull/5747))
- Fix a new Windows stdin notifier getting a read posted for the one it replaced ([PR #5762](https://github.com/ponylang/ponyc/pull/5762))
- Fix `F32.ldexp` linking on Windows ([PR #5775](https://github.com/ponylang/ponyc/pull/5775))
- Fix pony-lsp not working when your editor escapes characters in a file path ([PR #5777](https://github.com/ponylang/ponyc/pull/5777))
- Fix pony-lsp not working when your editor sends your project's location as a URI ([PR #5783](https://github.com/ponylang/ponyc/pull/5783))
- Fix quadratic type checking of large array literals ([PR #5790](https://github.com/ponylang/ponyc/pull/5790))
- Fix spurious 'can't reuse name' errors when a multi-file package has a syntax error ([PR #5147](https://github.com/ponylang/ponyc/pull/5147))
- Fix runtime crash when sending objects through `iso | val` unions ([PR #5799](https://github.com/ponylang/ponyc/pull/5799))

### Changed

- Correct the signature of `FloatingPoint.ldexp` ([PR #5772](https://github.com/ponylang/ponyc/pull/5772))
- Replace the signal handling system ([PR #4984](https://github.com/ponylang/ponyc/pull/4984))
- 32-bit ARM Linux is now a best-effort target ([PR #5795](https://github.com/ponylang/ponyc/pull/5795))

## [0.67.0] - 2026-07-11

### Fixed

- Fix crash when parsing, printing, or querying deeply nested JSON ([PR #5604](https://github.com/ponylang/ponyc/pull/5604))
- Reject an out-of-range --ponygcinitial exponent ([PR #5609](https://github.com/ponylang/ponyc/pull/5609))
- Restore the message send merging optimization ([PR #5602](https://github.com/ponylang/ponyc/pull/5602))
- Fix the start position reported for an empty JSON container's end token ([PR #5624](https://github.com/ponylang/ponyc/pull/5624))
- Fix the start position reported for a JSON String or Key token ([PR #5628](https://github.com/ponylang/ponyc/pull/5628))
- Fix systematic testing being much slower than it should be ([PR #5630](https://github.com/ponylang/ponyc/pull/5630))
- Fix runtime stats build options on Windows ([PR #5635](https://github.com/ponylang/ponyc/pull/5635))
- Fix pooltrack build option on Windows ([PR #5637](https://github.com/ponylang/ponyc/pull/5637))
- Fix delivery of zero-byte UDP datagrams ([PR #5644](https://github.com/ponylang/ponyc/pull/5644))
- Fix executables failing to start on Linux systems with both glibc and musl ([PR #5656](https://github.com/ponylang/ponyc/pull/5656))
- Fix json package emitting invalid JSON for non-finite floating-point values ([PR #5661](https://github.com/ponylang/ponyc/pull/5661))
- Fix `Sig.usr2()` reporting SIGUSR2 availability backwards ([PR #5667](https://github.com/ponylang/ponyc/pull/5667))
- Fix systematic testing occasionally hanging on Windows ([PR #5670](https://github.com/ponylang/ponyc/pull/5670))
- Fix json package losing precision when serializing floating-point values ([PR #5672](https://github.com/ponylang/ponyc/pull/5672))
- Fix TCP connections hanging on Windows ([PR #5683](https://github.com/ponylang/ponyc/pull/5683))
- Fix `term` mishandling of unrecognized escape sequences ([PR #5682](https://github.com/ponylang/ponyc/pull/5682))
- Fix `term` leaving deleted text on screen after ctrl-k ([PR #5686](https://github.com/ponylang/ponyc/pull/5686))
- Fix Windows link failure for `ProcessSocketNotifications` ([PR #5685](https://github.com/ponylang/ponyc/pull/5685))
- Fix `ANSITerm` not fully cleaning up on dispose ([PR #5687](https://github.com/ponylang/ponyc/pull/5687))
- Fix `Readline` nudging the cursor right on an empty line ([PR #5688](https://github.com/ponylang/ponyc/pull/5688))
- Fix `Readline.down` underflow on empty history ([PR #5689](https://github.com/ponylang/ponyc/pull/5689))
- Stop a socket read on a blocking file descriptor from hanging a program ([PR #5718](https://github.com/ponylang/ponyc/pull/5718))
- Stop a socket write on a blocking file descriptor from hanging a program ([PR #5726](https://github.com/ponylang/ponyc/pull/5726))
- Make `ArrayKeys.next()` partial ([PR #5714](https://github.com/ponylang/ponyc/pull/5714))
- Fix crash when disposing stdin input on Windows ([PR #5734](https://github.com/ponylang/ponyc/pull/5734))

### Added

- Add --version and --help support to pony-lsp ([PR #5668](https://github.com/ponylang/ponyc/pull/5668))
- Support runtime tracing on Windows ([PR #5676](https://github.com/ponylang/ponyc/pull/5676))
- Add `rewind()` to ArrayKeys and ArrayPairs ([PR #5645](https://github.com/ponylang/ponyc/pull/5645))
- Add `pony_os_sendv` for writing to a socket ([PR #5726](https://github.com/ponylang/ponyc/pull/5726))
- Add a streaming JSON parser ([PR #5658](https://github.com/ponylang/ponyc/pull/5658))

### Changed

- Stop installing the Pony runtime's C headers and static libraries ([PR #5620](https://github.com/ponylang/ponyc/pull/5620))
- Don't run the ASIO thread under systematic testing ([PR #5647](https://github.com/ponylang/ponyc/pull/5647))
- pony-lsp now rejects unrecognized command-line arguments ([PR #5668](https://github.com/ponylang/ponyc/pull/5668))
- Remove the rest of the library-mode runtime surface ([PR #5729](https://github.com/ponylang/ponyc/pull/5729))
- Change JSONTokenParser to carry values on its tokens ([PR #5658](https://github.com/ponylang/ponyc/pull/5658))

## [0.66.0] - 2026-06-29

### Fixed

- Fix systematic testing build failure under gcc ([PR #5584](https://github.com/ponylang/ponyc/pull/5584))
- Fix an intermittent systematic testing hang ([PR #5585](https://github.com/ponylang/ponyc/pull/5585))
- Improve memory usage ([PR #5594](https://github.com/ponylang/ponyc/pull/5594))

### Changed

- Replace Windows IOCP socket I/O with readiness notifications ([PR #5556](https://github.com/ponylang/ponyc/pull/5556))
- Remove support for Alpine 3.21 ([PR #5598](https://github.com/ponylang/ponyc/pull/5598))
- Remove support for Alpine 3.22 ([PR #5598](https://github.com/ponylang/ponyc/pull/5598))
- Remove support for Ubuntu 22.04 ([PR #5600](https://github.com/ponylang/ponyc/pull/5600))
- Update Docker image base to Alpine 3.24 ([PR #5599](https://github.com/ponylang/ponyc/pull/5599))

## [0.65.0] - 2026-06-27

### Fixed

- Fix `use=dtrace` builds on FreeBSD ([PR #5400](https://github.com/ponylang/ponyc/pull/5400))
- Fix compiler crashes from control expressions that jump away in value positions ([PR #5406](https://github.com/ponylang/ponyc/pull/5406))
- Reject self-referential type parameter constraints ([PR #5403](https://github.com/ponylang/ponyc/pull/5403))
- Report an error for infinitely recursive generic types ([PR #5411](https://github.com/ponylang/ponyc/pull/5411))
- Fix compiler crash on partial application of a method with a literal default argument ([PR #5412](https://github.com/ponylang/ponyc/pull/5412))
- Fix compiler crashes in while and repeat loops that jump away ([PR #5418](https://github.com/ponylang/ponyc/pull/5418))
- Reject tuple types hidden in an intersection within a type constraint ([PR #5439](https://github.com/ponylang/ponyc/pull/5439))
- Fix use=dtrace builds on macOS ([PR #5445](https://github.com/ponylang/ponyc/pull/5445))
- Fix intermittent crashes when compiling on multiple threads at once ([PR #5420](https://github.com/ponylang/ponyc/pull/5420))
- Reject self-referential iftype constraints inside lambdas and object literals ([PR #5423](https://github.com/ponylang/ponyc/pull/5423))
- Fix incorrect rejection and crashes for iftype conditions inside lambdas and object literals ([PR #5443](https://github.com/ponylang/ponyc/pull/5443))
- Fix runtime crash in optimized builds for types with 128-bit fields ([PR #5464](https://github.com/ponylang/ponyc/pull/5464))
- Fix `UDPSocket.set_multicast_interface` not setting the interface ([PR #5481](https://github.com/ponylang/ponyc/pull/5481))
- Fix `UDPSocket.set_multicast_loopback` and `set_multicast_ttl` having no effect ([PR #5481](https://github.com/ponylang/ponyc/pull/5481))
- Fix Windows process crash when a UDP socket fails to listen ([PR #5483](https://github.com/ponylang/ponyc/pull/5483))
- Make `UDPSocket.set_broadcast` a no-op on IPv6 sockets ([PR #5497](https://github.com/ponylang/ponyc/pull/5497))
- Fix crash when a directory is named like a Pony source file ([PR #5514](https://github.com/ponylang/ponyc/pull/5514))
- Fix NetAddress.scope() returning a byte-swapped value on little-endian platforms ([PR #5511](https://github.com/ponylang/ponyc/pull/5511))
- Fix crash when tracing actor behaviors without forced actor tracing ([PR #5522](https://github.com/ponylang/ponyc/pull/5522))
- Fix unnecessary reallocations when building small Strings and Arrays ([PR #5518](https://github.com/ponylang/ponyc/pull/5518))
- Fix linking of Pony programs on 32-bit ARM Linux ([PR #5526](https://github.com/ponylang/ponyc/pull/5526))
- Fix scheduler threads suspending after half the configured idle time ([PR #5535](https://github.com/ponylang/ponyc/pull/5535))
- Fix scheduler timing calculation bugs ([PR #5538](https://github.com/ponylang/ponyc/pull/5538))
- Fix brief scheduler busy-spin after a long idle on 32-bit ARM ([PR #5539](https://github.com/ponylang/ponyc/pull/5539))
- Truncate oversized UDP datagrams on Windows instead of dropping them ([PR #5552](https://github.com/ponylang/ponyc/pull/5552))
- Fix compiler crash when compiling very long expression sequences ([PR #5553](https://github.com/ponylang/ponyc/pull/5553))
- Make systematic testing reproducible with multiple scheduler threads when scheduler scaling is disabled ([PR #5561](https://github.com/ponylang/ponyc/pull/5561))
- Make systematic testing replay independent of memory layout ([PR #5566](https://github.com/ponylang/ponyc/pull/5566))
- Make systematic testing replay independent of memory layout for reference-counting messages ([PR #5570](https://github.com/ponylang/ponyc/pull/5570))
- Fix an intermittent hang when using systematic testing ([PR #5576](https://github.com/ponylang/ponyc/pull/5576))
- Make systematic testing replay independent of memory layout for cycle detector messages ([PR #5580](https://github.com/ponylang/ponyc/pull/5580))

### Added

- Add JsonPrinter for serializing any JsonValue ([PR #5397](https://github.com/ponylang/ponyc/pull/5397))
- Add Alpine 3.24 as a supported platform ([PR #5466](https://github.com/ponylang/ponyc/pull/5466))
- Compile C shims alongside Pony ([PR #5503](https://github.com/ponylang/ponyc/pull/5503))
- Support building with systematic testing on Windows ([PR #5574](https://github.com/ponylang/ponyc/pull/5574))

### Changed

- Use embedded LLD for native Linux sanitizer builds ([PR #5409](https://github.com/ponylang/ponyc/pull/5409))
- Remove serialization methods from JsonObject and JsonArray ([PR #5397](https://github.com/ponylang/ponyc/pull/5397))
- Rename JsonObject and JsonArray serialization methods ([PR #5397](https://github.com/ponylang/ponyc/pull/5397))
- Use embedded LLD for native FreeBSD sanitizer builds ([PR #5426](https://github.com/ponylang/ponyc/pull/5426))
- Use embedded LLD for FreeBSD use=dtrace builds ([PR #5440](https://github.com/ponylang/ponyc/pull/5440))
- Update supported OpenBSD version to 7.9 ([PR #5442](https://github.com/ponylang/ponyc/pull/5442))
- Use embedded LLD for native macOS sanitizer builds ([PR #5444](https://github.com/ponylang/ponyc/pull/5444))
- Reject use=dtrace at configure time on DragonFly and OpenBSD ([PR #5449](https://github.com/ponylang/ponyc/pull/5449))
- Remove the `--linker` and `--link-ldcmd` command line options ([PR #5452](https://github.com/ponylang/ponyc/pull/5452))
- Update supported FreeBSD 15 to 15.1 ([PR #5555](https://github.com/ponylang/ponyc/pull/5555))

## [0.64.0] - 2026-05-30

### Fixed

- Fix LSP range end positions overshooting past source line ends ([PR #5305](https://github.com/ponylang/ponyc/pull/5305))
- Fix LSP hover showing on declaration keywords ([PR #5306](https://github.com/ponylang/ponyc/pull/5306))
- Fix LSP hover showing on capability keywords ([PR #5307](https://github.com/ponylang/ponyc/pull/5307))
- Fix compiler hang and crash on recursive generic types ([PR #5197](https://github.com/ponylang/ponyc/pull/5197))
- LSP: drop behaviour return type from hover and signature help ([PR #5315](https://github.com/ponylang/ponyc/pull/5315))
- Fix LSP parameter hover to show valid Pony syntax ([PR #5319](https://github.com/ponylang/ponyc/pull/5319))
- Fix Windows TCP connection silently leaking state on IOCP errors ([PR #5317](https://github.com/ponylang/ponyc/pull/5317))
- Fix LSP hover for lambda types ([PR #5344](https://github.com/ponylang/ponyc/pull/5344))
- Trim whitespace from INI section names ([PR #5338](https://github.com/ponylang/ponyc/pull/5338))
- Fix spurious LSP inlay hints inside lambda type annotations ([PR #5349](https://github.com/ponylang/ponyc/pull/5349))
- Fix LSP document symbol outline dropping class members after lambda field initialisers ([PR #5350](https://github.com/ponylang/ponyc/pull/5350))
- Fix compiler crash when combining `iftype` and `as` ([PR #5330](https://github.com/ponylang/ponyc/pull/5330))
- Fix missing question mark check for partial calls in trait default bodies ([PR #5333](https://github.com/ponylang/ponyc/pull/5333))
- Fix typecheck assertion failure on loops whose branches all jump away ([PR #5334](https://github.com/ponylang/ponyc/pull/5334))
- Fix compiler crash when a behavior satisfies a non-tag interface method ([PR #5191](https://github.com/ponylang/ponyc/pull/5191))
- Fix duplicate error for partial call with type arguments ([PR #5335](https://github.com/ponylang/ponyc/pull/5335))
- Fix incorrect #any capability for type parameters with union constraints ([PR #5337](https://github.com/ponylang/ponyc/pull/5337))
- Reject adjacent string literals ([PR #5340](https://github.com/ponylang/ponyc/pull/5340))

### Added

- Add LSP call hierarchy support ([PR #5300](https://github.com/ponylang/ponyc/pull/5300))
- LSP now shows docstrings for class fields on hover ([PR #5320](https://github.com/ponylang/ponyc/pull/5320))
- Allow finite recursive type aliases ([PR #5246](https://github.com/ponylang/ponyc/pull/5246))

### Changed

- Replace stack-unwinding error handling with error-flag returns ([PR #5002](https://github.com/ponylang/ponyc/pull/5002))
- Remove the serialise package from the standard library ([PR #5002](https://github.com/ponylang/ponyc/pull/5002))
- Change socket runtime functions to use three-state result type ([PR #5002](https://github.com/ponylang/ponyc/pull/5002))
- Reject identity comparison between distinct concrete types ([PR #5345](https://github.com/ponylang/ponyc/pull/5345))
- Update to LLVM 22.1.6 ([PR #5364](https://github.com/ponylang/ponyc/pull/5364))
- Use embedded LLD for native FreeBSD builds ([PR #5368](https://github.com/ponylang/ponyc/pull/5368))
- Use embedded LLD for native DragonFly builds ([PR #5377](https://github.com/ponylang/ponyc/pull/5377))
- Use embedded LLD for native OpenBSD builds ([PR #5380](https://github.com/ponylang/ponyc/pull/5380))

## [0.63.4] - 2026-05-02

### Fixed

- Fix linking failures on Fedora and other RPM-based distributions ([PR #5262](https://github.com/ponylang/ponyc/pull/5262))
- Reject wrong-architecture libc startup objects on multilib hosts ([PR #5271](https://github.com/ponylang/ponyc/pull/5271))
- Fix spurious pony-lsp inlay hints on primitive types ([PR #5275](https://github.com/ponylang/ponyc/pull/5275))
- Fix match exhaustiveness for Bool value patterns in tuples ([PR #5226](https://github.com/ponylang/ponyc/pull/5226))
- Fix pony-lsp document symbols showing spurious eq/ne for bare primitives ([PR #5278](https://github.com/ponylang/ponyc/pull/5278))

### Added

- Ubuntu 26.04 added as a supported platform ([PR #5256](https://github.com/ponylang/ponyc/pull/5256))
- Add LSP `textDocument/signatureHelp` support ([PR #5259](https://github.com/ponylang/ponyc/pull/5259))
- Add pony-lsp inlay hints for function parameter types ([PR #5274](https://github.com/ponylang/ponyc/pull/5274))
- Add LSP type hierarchy support ([PR #5297](https://github.com/ponylang/ponyc/pull/5297))

### Changed

- Remove binutils-gold from nightly and release Docker images ([PR #5270](https://github.com/ponylang/ponyc/pull/5270))

## [0.63.3] - 2026-04-25

### Fixed

- Fix compiler crash when passing an array literal to `OutStream.writev` ([PR #5192](https://github.com/ponylang/ponyc/pull/5192))
- Fix runtime crash with iso in mixed-capability union type ([PR #4809](https://github.com/ponylang/ponyc/pull/4809))
- Fix LSP symbol range semantics ([PR #5241](https://github.com/ponylang/ponyc/pull/5241))
- Fix LSP definition and type-definition ranges ([PR #5247](https://github.com/ponylang/ponyc/pull/5247))
- Fix LSP outline including synthetic and inherited members ([PR #5249](https://github.com/ponylang/ponyc/pull/5249))

### Added

- Add LSP `textDocument/selectionRange` support ([PR #5236](https://github.com/ponylang/ponyc/pull/5236))
- Add LSP `workspace/symbol` support ([PR #5239](https://github.com/ponylang/ponyc/pull/5239))

### Changed

- Strengthen memory ordering on runtime queue pushes ([PR #5245](https://github.com/ponylang/ponyc/pull/5245))

## [0.63.2] - 2026-04-19

### Added

- Add LSP `workspace/inlayHint/refresh` support ([PR #5224](https://github.com/ponylang/ponyc/pull/5224))
- Extend LSP inlay hints with generic caps, return type caps, and receiver caps ([PR #5222](https://github.com/ponylang/ponyc/pull/5222))
- Add LSP `textDocument/declaration` support ([PR #5229](https://github.com/ponylang/ponyc/pull/5229))
- Add LSP `textDocument/rename` and `textDocument/prepareRename` support ([PR #5228](https://github.com/ponylang/ponyc/pull/5228))
- Add LSP `textDocument/typeDefinition` support ([PR #5231](https://github.com/ponylang/ponyc/pull/5231))

## [0.63.1] - 2026-04-11

### Fixed

- Fix rare silent connection hangs on macOS and BSD ([PR #5121](https://github.com/ponylang/ponyc/pull/5121))
- Fix rare silent connection hangs on Linux ([PR #5131](https://github.com/ponylang/ponyc/pull/5131))
- Fix bug in pony-lsp's goto definition ([PR #5123](https://github.com/ponylang/ponyc/pull/5123))
- Fix pony-lsp failures with some code constructs ([PR #5144](https://github.com/ponylang/ponyc/pull/5144))
- Fix silent timer hangs on Linux ([PR #5151](https://github.com/ponylang/ponyc/pull/5151))
- Fix pony-lsp hanging after shutdown and exit ([PR #5170](https://github.com/ponylang/ponyc/pull/5170))
- Fix pony-lsp hanging on startup on Windows ([PR #5171](https://github.com/ponylang/ponyc/pull/5171))
- Fix type checking failure for interfaces with interdependent type parameters ([PR #3664](https://github.com/ponylang/ponyc/pull/3664))
- Fix incorrect code generation for `this->` in lambda type parameters ([PR #5127](https://github.com/ponylang/ponyc/pull/5127))
- Fix soundness hole in match capture bindings ([PR #4975](https://github.com/ponylang/ponyc/pull/4975))
- Fix segfault when matching tuple elements against unions or interfaces via Any ([PR #5134](https://github.com/ponylang/ponyc/pull/5134))

### Added

- Add style/docstring-leading-blank lint rule ([PR #5122](https://github.com/ponylang/ponyc/pull/5122))
- Add hierarchical configuration for pony-lint ([PR #5135](https://github.com/ponylang/ponyc/pull/5135))
- Protect pony-lint against oversize configuration files ([PR #5138](https://github.com/ponylang/ponyc/pull/5138))
- Protect pony-lint against oversize ignore files ([PR #5140](https://github.com/ponylang/ponyc/pull/5140))
- Add LSP `textDocument/documentHighlight` support ([PR #5111](https://github.com/ponylang/ponyc/pull/5111))
- Add LSP `textDocument/inlayHint` support ([PR #5159](https://github.com/ponylang/ponyc/pull/5159))
- Add LSP `textDocument/references` support ([PR #5165](https://github.com/ponylang/ponyc/pull/5165))
- Add LSP go-to-definition for type aliases ([PR #5163](https://github.com/ponylang/ponyc/pull/5163))
- Add kind to pony-lsp document highlights ([PR #5188](https://github.com/ponylang/ponyc/pull/5188))
- Add generic type parameter highlights to pony-lsp ([PR #5190](https://github.com/ponylang/ponyc/pull/5190))
- Add textDocument/references for generic type parameters in pony-lsp ([PR #5221](https://github.com/ponylang/ponyc/pull/5221))

## [0.63.0] - 2026-04-04

### Fixed

- Fix use-after-free in IOCP ASIO system ([PR #5091](https://github.com/ponylang/ponyc/pull/5091))
- Fix with tuple only processing first binding in build_with_dispose ([PR #5095](https://github.com/ponylang/ponyc/pull/5095))
- Fix memory leak in Windows networking subsystem ([PR #5096](https://github.com/ponylang/ponyc/pull/5096))
- Fix spurious error when assigning to a field on an `as` cast in a try block ([PR #5070](https://github.com/ponylang/ponyc/pull/5070))
- Fix segfault when using Generator.map with PonyCheck shrinking ([PR #5006](https://github.com/ponylang/ponyc/pull/5006))
- Fix pony-lint blank-lines rule false positives on multi-line docstrings ([PR #5109](https://github.com/ponylang/ponyc/pull/5109))
- Fix `FloatingPoint.frexp` returning unsigned exponent ([PR #5113](https://github.com/ponylang/ponyc/pull/5113))
- Fix asymmetric NaN handling in F32/F64 min and max ([PR #5114](https://github.com/ponylang/ponyc/pull/5114))

### Added

- Add --shuffle option to PonyTest ([PR #5076](https://github.com/ponylang/ponyc/pull/5076))

### Changed

- Remove support for Alpine 3.20 ([PR #5094](https://github.com/ponylang/ponyc/pull/5094))
- Remove docgen pass ([PR #5097](https://github.com/ponylang/ponyc/pull/5097))
- Change `FloatingPoint.frexp` exponent return type from `U32` to `I32` ([PR #5113](https://github.com/ponylang/ponyc/pull/5113))
- Use LLVM intrinsics for NaN-propagating float min and max ([PR #5114](https://github.com/ponylang/ponyc/pull/5114))

## [0.62.1] - 2026-03-28

### Fixed

- Fix IOCP use-after-free crash ([PR #5055](https://github.com/ponylang/ponyc/pull/5055))
- Fix pony-lint FileNaming false positives on Windows ([PR #5059](https://github.com/ponylang/ponyc/pull/5059))
- Enforce documented maximum for --ponysuspendthreshold ([PR #5061](https://github.com/ponylang/ponyc/pull/5061))
- Fix compiler crash when calling methods on invalid shift expressions ([PR #5063](https://github.com/ponylang/ponyc/pull/5063))
- Enforce documented bounds for --ponycdinterval ([PR #5065](https://github.com/ponylang/ponyc/pull/5065))
- Fix code generation failure for iftype with union return type ([PR #5066](https://github.com/ponylang/ponyc/pull/5066))
- Add missing NULL checks for gen_expr results in gencall.c ([PR #5067](https://github.com/ponylang/ponyc/pull/5067))
- Fix type system soundness hole ([PR #4963](https://github.com/ponylang/ponyc/pull/4963))
- Fix cap_isect_constraint returning incorrect capability for empty intersections ([PR #4999](https://github.com/ponylang/ponyc/pull/4999))
- Fix POOL_FREE first argument in painter_tidy ([PR #5082](https://github.com/ponylang/ponyc/pull/5082))

## [0.62.0] - 2026-03-21

### Fixed

- Fix incorrect CLOCK_MONOTONIC value on OpenBSD ([PR #5035](https://github.com/ponylang/ponyc/pull/5035))
- Fix illegal instruction crashes in pony-lint, pony-lsp, and pony-doc ([PR #5041](https://github.com/ponylang/ponyc/pull/5041))
- Fix failure to build pony tools with Homebrew ([PR #5042](https://github.com/ponylang/ponyc/pull/5042))
- Fix memory leak and re-enable immutable-send GC optimization ([PR #4944](https://github.com/ponylang/ponyc/pull/4944))
- Fix intermittent hang during runtime shutdown ([PR #5037](https://github.com/ponylang/ponyc/pull/5037))
- Fix tuple literals not matching correctly in union-of-tuples types ([PR #4970](https://github.com/ponylang/ponyc/pull/4970))
- Fix false positive in _final send checking for generic classes ([PR #4982](https://github.com/ponylang/ponyc/pull/4982))
- Fix `#share` capability constraint intersection ([PR #4998](https://github.com/ponylang/ponyc/pull/4998))
- Fix use-after-free crash in IOCP runtime on Windows ([PR #5046](https://github.com/ponylang/ponyc/pull/5046))
- Fix pony_os_ip_string returning NULL for valid IP addresses ([PR #5049](https://github.com/ponylang/ponyc/pull/5049))
- Fix pony-lint ignore matching on Windows ([PR #5050](https://github.com/ponylang/ponyc/pull/5050))
- Fix pony-lsp on Windows ([PR #5050](https://github.com/ponylang/ponyc/pull/5050))

### Changed

- Don't allow --path to override standard library ([PR #5040](https://github.com/ponylang/ponyc/pull/5040))

## [0.61.1] - 2026-03-14

### Fixed

- Fix pool_memalign crash due to insufficient alignment for AVX instructions ([PR #4909](https://github.com/ponylang/ponyc/pull/4909))
- Fix `assignment-indent` to require RHS indented relative to assignment ([PR #4913](https://github.com/ponylang/ponyc/pull/4913))
- Fix tool install with `use` flags ([PR #4915](https://github.com/ponylang/ponyc/pull/4915))
- Fix stack overflow in AST tree checker ([PR #4905](https://github.com/ponylang/ponyc/pull/4905))
- Fix Scheduler Stats output for memory usage ([PR #4916](https://github.com/ponylang/ponyc/pull/4916))
- Fix compiler crash when object literal implements enclosing trait ([PR #4919](https://github.com/ponylang/ponyc/pull/4919))
- Fix TCPListener accept loop spin on persistent errors ([PR #4917](https://github.com/ponylang/ponyc/pull/4917))
- Fix compilation not correctly triggered upon startup with pony-lsp ([PR #4930](https://github.com/ponylang/ponyc/pull/4930))
- Fix compiler crash in HeapToStack optimization pass on Windows ([PR #4938](https://github.com/ponylang/ponyc/pull/4938))
- Fix exhaustive match on tuples of union types ([PR #4939](https://github.com/ponylang/ponyc/pull/4939))
- Fix non-sendable data seen as sendable in generic recover blocks ([PR #4953](https://github.com/ponylang/ponyc/pull/4953))
- Fix SEGV when sending a union of tuples to an actor ([PR #4959](https://github.com/ponylang/ponyc/pull/4959))

### Added

- Compile-time string literal concatenation ([PR #4900](https://github.com/ponylang/ponyc/pull/4900))
- Add `--sysroot` option for cross-compilation ([PR #4964](https://github.com/ponylang/ponyc/pull/4964))
- Support `--sysroot` for native Linux builds ([PR #4971](https://github.com/ponylang/ponyc/pull/4971))
- Add OpenBSD 7.8 as a tier 3 CI target ([PR #5003](https://github.com/ponylang/ponyc/pull/5003))
- Add safety/exhaustive-match lint rule to pony-lint ([PR #4904](https://github.com/ponylang/ponyc/pull/4904))
- Add DragonFly BSD 6.4.2 as a tier 3 CI target ([PR #5009](https://github.com/ponylang/ponyc/pull/5009))
- Add json and iregex packages to the standard library ([PR #4903](https://github.com/ponylang/ponyc/pull/4903))
- Add pony-doc and pony-lint to Windows distribution ([PR #5016](https://github.com/ponylang/ponyc/pull/5016))

### Changed

- Update to LLVM 21.1.8 ([PR #4876](https://github.com/ponylang/ponyc/pull/4876))
- Exempt unsplittable string literals from line length rule ([PR #4923](https://github.com/ponylang/ponyc/pull/4923))
- Use embedded LLD for cross-compilation to Linux targets ([PR #4964](https://github.com/ponylang/ponyc/pull/4964))
- Use embedded LLD for native Linux builds ([PR #4971](https://github.com/ponylang/ponyc/pull/4971))
- Native macOS builds now use embedded LLD ([PR #4993](https://github.com/ponylang/ponyc/pull/4993))
- Native Windows builds now use embedded LLD ([PR #4996](https://github.com/ponylang/ponyc/pull/4996))

## [0.61.0] - 2026-02-28

### Fixed

- Fix pony-lsp inability to find the standard library ([PR #4829](https://github.com/ponylang/ponyc/pull/4829))
- Make pony-lsp version dynamic to match ponyc version ([PR #4830](https://github.com/ponylang/ponyc/pull/4830))
- Fix persistent HashMap returning incorrect results for None values ([PR #4839](https://github.com/ponylang/ponyc/pull/4839))
- Fix stack overflow in reachability pass on deeply nested ASTs ([PR #4858](https://github.com/ponylang/ponyc/pull/4858))

### Added

- Add pony-lint to the ponyc distribution ([PR #4842](https://github.com/ponylang/ponyc/pull/4842))
- Add configuration from lsp-client and improve diagnostics handling ([PR #4837](https://github.com/ponylang/ponyc/pull/4837))
- Add `\exhaustive\` annotation for match expressions ([PR #4863](https://github.com/ponylang/ponyc/pull/4863))

### Changed

- Changed persistent hash map apply signature ([PR #4839](https://github.com/ponylang/ponyc/pull/4839))
- Update Docker image base to Alpine 3.23 ([PR #4887](https://github.com/ponylang/ponyc/pull/4887))

## [0.60.6] - 2026-02-06

### Fixed

- Fix crash when ephemeral type used in parameter with default argument ([PR #4796](https://github.com/ponylang/ponyc/pull/4796))
- Fix incorrect array element type inference for union types ([PR #4794](https://github.com/ponylang/ponyc/pull/4794))
- Fix segfault when lambda captures uninitialized field ([PR #4791](https://github.com/ponylang/ponyc/pull/4791))
- Fix compiler crash when assigning to ephemeral capability type ([PR #4790](https://github.com/ponylang/ponyc/pull/4790))

### Added

- Add Alpine 3.23 support ([PR #4803](https://github.com/ponylang/ponyc/pull/4803))

### Changed

- Update Docker Image Base to Alpine 3.23 ([PR #4804](https://github.com/ponylang/ponyc/pull/4804))

## [0.60.5] - 2026-01-31

### Fixed

- Fix crash when partially applying constructors ([PR #4783](https://github.com/ponylang/ponyc/pull/4783))
- Fix crash when using bare integer literals in array match patterns ([PR #4797](https://github.com/ponylang/ponyc/pull/4797))

### Added

- Add Pony Language Server to the ponyc distribution ([PR #4777](https://github.com/ponylang/ponyc/pull/4777))
- Handle Bool with exhaustive match ([PR #4782](https://github.com/ponylang/ponyc/pull/4782))
- Add support for complex type formatting in LSP hover ([PR #4785](https://github.com/ponylang/ponyc/pull/4785))
- Add hover support for generic types in LSP ([PR #4793](https://github.com/ponylang/ponyc/pull/4793))
- Add extra hover support to LSP ([PR #4795](https://github.com/ponylang/ponyc/pull/4795))
- Add hover support for receiver capability to LSP ([PR #4798](https://github.com/ponylang/ponyc/pull/4798))
- Add support for go to definition for arrow types in LSP ([PR #4792](https://github.com/ponylang/ponyc/pull/4792))

## [0.60.4] - 2025-10-31

### Added

- Add Alpine 3.22 as a supported platform ([PR #4760](https://github.com/ponylang/ponyc/pull/4760))

### Changed

- Stop creating Fedora 41 builds ([PR #4763](https://github.com/ponylang/ponyc/pull/4763))

## [0.60.3] - 2025-10-20

### Added

- Add Multiplatform Versioned Release Docker Images ([PR #4754](https://github.com/ponylang/ponyc/pull/4754))

### Changed

- Stop building -alpine versioned container images ([PR #4751](https://github.com/ponylang/ponyc/pull/4751))
- Stop Creating Generic musl Builds ([PR #4752](https://github.com/ponylang/ponyc/pull/4752))
- Stop Creating "Alpine" Docker Images ([PR #4753](https://github.com/ponylang/ponyc/pull/4753))

## [0.60.2] - 2025-10-18

### Changed

- Add Multiplatform Release Docker Images ([PR #4749](https://github.com/ponylang/ponyc/pull/4749))

## [0.60.1] - 2025-10-15

### Fixed

- Fix Arm64 Linux Releases ([#4748])(https://github.com/ponylang/ponyc/pull/4748)

## [0.60.0] - 2025-10-15

### Fixed

- Make the check for Visual Studio more robust ([PR #4722](https://github.com/ponylang/ponyc/pull/4722))
- Fix linking on Linux arm64 when using musl libc ([PR #4726](https://github.com/ponylang/ponyc/pull/4726))

### Added

- Add Alpine 3.20 as a supported platform ([PR #4709](https://github.com/ponylang/ponyc/pull/4709))
- Add Alpine 3.21 as a supported platform ([PR #4710](https://github.com/ponylang/ponyc/pull/4710))
- Add Ubuntu 24.04 on arm64 as a supported platform ([PR #4714](https://github.com/ponylang/ponyc/pull/4714))
- Add Alpine 3.21 on arm64 as a supported platform ([PR #4716](https://github.com/ponylang/ponyc/pull/4716))
- Support building ponyc natively on arm64 Windows machines ([PR #4689](https://github.com/ponylang/ponyc/pull/4689))
- Add arm64 Windows as a supported platform ([PR #4721](https://github.com/ponylang/ponyc/pull/4721))
- Add Multiplatform Nightly Docker Image ([PR #4731](https://github.com/ponylang/ponyc/pull/4731))

### Changed

- Drop Ubuntu 20.04 Support ([PR #4693](https://github.com/ponylang/ponyc/pull/4693))
- Don't set gold as the default ponyc linker on Linux ([PR #4704](https://github.com/ponylang/ponyc/pull/4704))
- Update to LLVM 18.1.8 ([PR #4701](https://github.com/ponylang/ponyc/pull/4701))
- Update Pony nightly musl Docker image to Alpine 3.21 ([PR #4745](https://github.com/ponylang/ponyc/pull/4745))
- Stop building Windows container images ([PR #4746](https://github.com/ponylang/ponyc/pull/4746))
- Stop building glibc based ponyc images ([PR #4747](https://github.com/ponylang/ponyc/pull/4747))

## [0.59.0] - 2025-04-26

### Fixed

- Prevent memory explosion when using ponynoblock in some programs ([PR #4666](https://github.com/ponylang/ponyc/pull/4666))
- Make GC for an actor more aggressive if an actor GC frees many refs ([PR #4662](https://github.com/ponylang/ponyc/pull/4662))

### Added

- Add ability to trace runtime events in chromium json format ([PR #4649](https://github.com/ponylang/ponyc/pull/4649))

### Changed

- Make pony programs exit on an unrecognized pony runtime option ([PR #4622](https://github.com/ponylang/ponyc/pull/4622))
- Update to LLVM 17.0.1 ([PR #4680](https://github.com/ponylang/ponyc/pull/4680))

## [0.58.13] - 2025-03-09

### Fixed

- Make sure systematic testing doesn't switch to suspended thread ([PR #4647](https://github.com/ponylang/ponyc/pull/4647))
- Fix race condition in epoll ASIO system ([PR #4658](https://github.com/ponylang/ponyc/pull/4658))

## [0.58.12] - 2025-03-01

### Fixed

- Don't duplicate match checks for inherited trait bodies ([PR #4628](https://github.com/ponylang/ponyc/pull/4628))
- Don't duplicate visibility tests for inherited trait bodies ([PR #4640](https://github.com/ponylang/ponyc/pull/4640))

## [0.58.11] - 2025-02-22

### Fixed

- Fix use-after-free triggered by fast actor reaping when the cycle detector is active ([PR #4616](https://github.com/ponylang/ponyc/pull/4616))
- Fix incorrect printing of runtime stats ([PR #4620](https://github.com/ponylang/ponyc/pull/4620))
- Fix memory leak ([PR #4621](https://github.com/ponylang/ponyc/pull/4621))
- Fix being unable to compile programs that use runtime info on Windows ([PR #4625](https://github.com/ponylang/ponyc/pull/4625))

## [0.58.10] - 2025-02-01

### Fixed

- Make sure scheduler threads don't ACK the quiescence protocol CNF messages if they have an actor waiting to be run ([PR #4583](https://github.com/ponylang/ponyc/pull/4583))
- Apply default options for a CLI parent command when a sub command is parsed ([PR #4593](https://github.com/ponylang/ponyc/pull/4593))
- Fix compiler crash from `match` with extra parens around `let` in tuple ([PR #4595](https://github.com/ponylang/ponyc/pull/4595))
- Fix soundness problem when matching `iso` variables ([PR #4588](https://github.com/ponylang/ponyc/pull/4588))

### Changed

- Change stack_depth_t to size_t on OpenBSD ([PR #4575](https://github.com/ponylang/ponyc/pull/4575))

## [0.58.9] - 2024-12-29

### Fixed

- Fixed an issue that caused the `actor_pinning` documentation to not be built

## [0.58.8] - 2024-12-27

### Fixed

- Fix rare termination logic failures that could result in early shutdown ([PR #4556](https://github.com/ponylang/ponyc/pull/4556))

### Added

- Add Fedora 41 as a supported platform ([PR #4557](https://github.com/ponylang/ponyc/pull/4557))
- Add support for pinning actors to a dedicated scheduler thread ([PR #4547](https://github.com/ponylang/ponyc/pull/4547))

### Changed

- Drop Fedora 39 support ([PR #4558](https://github.com/ponylang/ponyc/pull/4558))
- Update Pony musl Docker images to Alpine 3.20 ([PR #4562](https://github.com/ponylang/ponyc/pull/4562))

## [0.58.7] - 2024-11-30

### Fixed

- Correctly find custom-built `llc` ([PR #4537](https://github.com/ponylang/ponyc/pull/4537))
- Fix buffer out of bounds access issue ([PR #4540](https://github.com/ponylang/ponyc/pull/4540))
- Fix bug in ASIO shutdown ([PR #4548](https://github.com/ponylang/ponyc/pull/4548))
- Fix early quiescence/termination bug ([PR #4550](https://github.com/ponylang/ponyc/pull/4550))

### Changed

- Recycle actor heap chunks after GC instead of returning to pool ([PR #4531](https://github.com/ponylang/ponyc/pull/4531))

## [0.58.6] - 2024-10-16

### Fixed

- Fix use after free bug in actor heap finalisation that can lead to a segfault ([PR #4522](https://github.com/ponylang/ponyc/pull/4522))
- Make heap small chunk size setting logic more precise/correct ([PR #4527](https://github.com/ponylang/ponyc/pull/4527))

## [0.58.5] - 2024-06-01

### Changed

- Update the base image for our ponyc images ([PR #4515](https://github.com/ponylang/ponyc/pull/4515))

## [0.58.4] - 2024-05-01

### Fixed

- Fix compiler crash ([PR #4505](https://github.com/ponylang/ponyc/pull/4505))
- Fix generation of invalid LLVM IR  ([PR #4506](https://github.com/ponylang/ponyc/pull/4506))

### Added

- Add prebuilt ponyc binaries for Ubuntu 24.04 ([PR #4508](https://github.com/ponylang/ponyc/pull/4508))

## [0.58.3] - 2024-03-30

### Fixed

- Fix bug in documentation generation ([PR #4502](https://github.com/ponylang/ponyc/pull/4502))

## [0.58.2] - 2024-02-24

### Fixed

- Fix for potential memory corruption in `Array.copy_to` ([PR #4490](https://github.com/ponylang/ponyc/pull/4490))
- Fix bug when serializing bare lambdas ([PR #4486](https://github.com/ponylang/ponyc/pull/4486))

### Added

- Add Fedora 39 as a supported platform ([PR #4485](https://github.com/ponylang/ponyc/pull/4485))
- Add MacOS on Apple Silicon as a supported platform ([PR #4487](https://github.com/ponylang/ponyc/pull/4487))
- Add constrained_types package to the standard library ([PR #4493](https://github.com/ponylang/ponyc/pull/4493))

## [0.58.1] - 2024-01-27

### Fixed

- Fix missing "runtime_info" package documentation ([PR #4476](https://github.com/ponylang/ponyc/pull/4476))
- Use the correct LLVM intrinsics for `powi` on *nix. ([PR #4481](https://github.com/ponylang/ponyc/pull/4481))

## [0.58.0] - 2023-11-24

### Changed

- Disallow `return` at the end of a `with` block ([PR #4467](https://github.com/ponylang/ponyc/pull/4467))
- Make the `verify` pass on by default ([PR #4036](https://github.com/ponylang/ponyc/pull/4036))

## [0.57.1] - 2023-10-29

### Fixed

- Fix compiling Pony programs on X86 MacOS when XCode 15 is the linker ([PR #4466](https://github.com/ponylang/ponyc/pull/4466))

## [0.57.0] - 2023-10-08

### Fixed

- Fix broken DTrace support ([PR #4453](https://github.com/ponylang/ponyc/pull/4453))
- Fix compilation error when building with pool_memalign in release mode ([PR #4455](https://github.com/ponylang/ponyc/pull/4455))
- Fix compiler bug that allows an unsafe data access pattern ([PR #4458](https://github.com/ponylang/ponyc/pull/4458))

### Changed

- Fix compiler bug that allows an unsafe data access pattern ([PR #4458](https://github.com/ponylang/ponyc/pull/4458))

## [0.56.2] - 2023-09-16

### Added

- "No op" release to get Windows release out

## [0.56.1] - 2023-09-16

### Fixed

- Fix "double socket close" issue with Windows version of TCPConnection ([PR #4437](https://github.com/ponylang/ponyc/pull/4437))

## [0.56.0] - 2023-08-30

### Fixed

- Avoid hangs in async pony_check properties when using actions ([PR #4405](https://github.com/ponylang/ponyc/pull/4405))

### Added

- Add macOS on Intel as fully supported platform ([PR #4390](https://github.com/ponylang/ponyc/pull/4390))

### Changed

- Drop support for Alpine versions prior to 3.17 ([PR #4407](https://github.com/ponylang/ponyc/pull/4407))
- Update Pony musl Docker images to Alpine 3.18 ([PR #4407](https://github.com/ponylang/ponyc/pull/4407))
- Drop FreeBSD as a supported platform ([PR #4382](https://github.com/ponylang/ponyc/pull/4382))
- Drop macOS on Apple Silicon as a fully supported platform ([PR #4403](https://github.com/ponylang/ponyc/pull/4403))

## [0.55.1] - 2023-08-16

### Fixed

- Fix broken linking when using a sanitizer ([PR #4393](https://github.com/ponylang/ponyc/pull/4393))
- Fix memory errors with some `--debug` program builds ([PR #4372](https://github.com/ponylang/ponyc/pull/4372))

### Changed

- Stop putting `stable` in ponyc Docker images ([PR #4353](https://github.com/ponylang/ponyc/pull/4353))
- Move heap ownership info from chunk to pagemap ([PR #4371](https://github.com/ponylang/ponyc/pull/4371))

## [0.55.0] - 2023-05-27

### Changed

- Change supported MacOS version from Monterey to Ventura ([PR #4349](https://github.com/ponylang/ponyc/pull/4349))
- Fix a possible resource leak with `with` blocks ([PR #4347](https://github.com/ponylang/ponyc/pull/4347))
- Drop Ubuntu 18.04 support ([PR #4351](https://github.com/ponylang/ponyc/pull/4351))

## [0.54.1] - 2023-04-12

### Fixed

- Fix bug in HeapToStack optimization pass ([PR #4341](https://github.com/ponylang/ponyc/pull/4341))

### Changed

- LLVM 15 ([PR #4327](https://github.com/ponylang/ponyc/pull/4327))

## [0.54.0] - 2023-02-27

### Fixed

- Remove ambiguity from "not safe to write" compiler error message ([PR #4299](https://github.com/ponylang/ponyc/pull/4299))
- Fix waiting on Windows to be sure I/O events can still come in. ([PR #4325](https://github.com/ponylang/ponyc/pull/4325))

### Added

- Create libponyc-standalone on MacOS ([PR #4303](https://github.com/ponylang/ponyc/pull/4303))
- Build ponyc-standalone.lib for windows ([PR #4307](https://github.com/ponylang/ponyc/pull/4307))

### Changed

- Update DTrace probes ([PR #4302](https://github.com/ponylang/ponyc/pull/4302))
- Stop building the "x86-64-unknown-linux-gnu" ponyc package ([PR #4312](https://github.com/ponylang/ponyc/pull/4312))
- Remove json package from the standard library ([PR #4323])(https://github.com/ponylang/ponyc/pull/4323)

## [0.53.0] - 2023-01-04

### Fixed

- Fix infinite loop in compiler ([PR #4293](https://github.com/ponylang/ponyc/pull/4293))
- Fix compiler segfault caused by infinite recursion ([PR #4292](https://github.com/ponylang/ponyc/pull/4292))
- Fix runtime segfault ([PR #4294](https://github.com/ponylang/ponyc/pull/4294))

### Changed

- Implement empty ranges RFC ([PR #4280](https://github.com/ponylang/ponyc/pull/4280))

## [0.52.5] - 2022-12-30

### Fixed

- Fix compiler crash introduced in #4283 ([PR #4288](https://github.com/ponylang/ponyc/pull/4288))

## [0.52.4] - 2022-12-29

### Fixed

- Fix an assert in `call.c` when checking an invalid argument for autorecover ([PR #4278](https://github.com/ponylang/ponyc/pull/4278))
- Fix an issue with infinite loops while typechecking some expressions ([PR #4274](https://github.com/ponylang/ponyc/pull/4274))
- Fix soundness bug introduced in Pony 0.51.2 ([PR #4283](https://github.com/ponylang/ponyc/pull/4283))

## [0.52.3] - 2022-12-16

### Fixed

- Fix segfault caused by unsafe garbage collection optimization ([PR #4256](https://github.com/ponylang/ponyc/pull/4256))
- Fix incorrectly implemented PR #4243 ([PR #4276](https://github.com/ponylang/ponyc/pull/4276))

### Changed

- Remove macOS on Intel as a supported platform ([PR #4270](https://github.com/ponylang/ponyc/pull/4270))

## [0.52.2] - 2022-12-01

### Fixed

- Fix multiple races within actor/cycle detector interactions ([PR #4251](https://github.com/ponylang/ponyc/pull/4251))
- Fix crash when calling `(this.)create()` ([PR #4263](https://github.com/ponylang/ponyc/pull/4263))

### Added

- Don't include "home file" in documentation search ([PR #4243](https://github.com/ponylang/ponyc/pull/4243))
- Add support for erase left and erase line in term.ANSI ([PR #4246](https://github.com/ponylang/ponyc/pull/4246))

### Changed

- Improve TCP backpressure handling on Windows ([PR #4252](https://github.com/ponylang/ponyc/pull/4252))
- Update supported FreeBSD to 13.1 ([PR #4185](https://github.com/ponylang/ponyc/pull/4185))
- Drop Rocky 8 support ([PR #4262](https://github.com/ponylang/ponyc/pull/4262))

## [0.52.1] - 2022-11-14

### Added

- Update docgen to generate source files that are ignored ([PR #4239](https://github.com/ponylang/ponyc/pull/4239))

## [0.52.0] - 2022-11-10

### Fixed

- Avoid fairly easy to trigger overflow in Windows Time.nanos code ([PR #4227](https://github.com/ponylang/ponyc/pull/4227))
- Fix incorrect interaction between String/Array reserve and Pointer realloc ([PR #4223](https://github.com/ponylang/ponyc/pull/4223))
- Fix broken documentation generation on Windows ([PR #4226](https://github.com/ponylang/ponyc/pull/4226))

### Changed

- Sort package types in documentation ([PR #4228](https://github.com/ponylang/ponyc/pull/4228))
- Adapt documentation generation to use the mkdocs material theme ([PR #4226](https://github.com/ponylang/ponyc/pull/4226)

## [0.51.4] - 2022-10-29

### Fixed

- Fix broken readline package ([PR #4199](https://github.com/ponylang/ponyc/pull/4199))

## [0.51.3] - 2022-10-02

### Fixed

- Fix bug in `StdStream.print` ([PR #4180](https://github.com/ponylang/ponyc/pull/4180))
- Fix identity comparison check with desugared creations ([PR #4182](https://github.com/ponylang/ponyc/pull/4182))

## [0.51.2] - 2022-08-26

### Fixed

- Fix for crash when methods with default private type params in remote packages are called  ([PR #4167](https://github.com/ponylang/ponyc/pull/4167))
- Fix incorrect atomics usage ([PR #4159](https://github.com/ponylang/ponyc/pull/4159))

### Added

- Auto-recover constructor expressions ([PR #4124](https://github.com/ponylang/ponyc/pull/4124))
- Support for RISC-V ([PR #3435](https://github.com/ponylang/ponyc/pull/3435))
- Enhance runtime stats tracking ([PR #4144](https://github.com/ponylang/ponyc/pull/4144))

## [0.51.1] - 2022-06-29

### Fixed

- Fix String.f32 and String.f64 errors with non null terminated strings ([PR #4132](https://github.com/ponylang/ponyc/pull/4132))
- Fix for infinite Ranges ([PR #4127](https://github.com/ponylang/ponyc/pull/4127))
- Ensure reachability of types returned by FFI calls ([PR #4149](https://github.com/ponylang/ponyc/pull/4149))
- Support void* (Pointer[None]) parameters in bare lambdas and functions ([PR #4152](https://github.com/ponylang/ponyc/pull/4152))

### Added

- Avoid clearing chunks at start of GC ([PR #4143](https://github.com/ponylang/ponyc/pull/4143))
- Systematic testing for the runtime ([PR #4140](https://github.com/ponylang/ponyc/pull/4140))

### Changed

- Update to basing musl images off of Alpine 3.16 ([PR #4139](https://github.com/ponylang/ponyc/pull/4139))

## [0.51.0] - 2022-05-29

### Fixed

- Disable incorrect runtime assert for ASIO thread shutdown. ([PR #4122](https://github.com/ponylang/ponyc/pull/4122))

### Added

- Add prebuilt ponyc releases on MacOS for Apple Silicon ([PR #4119](https://github.com/ponylang/ponyc/pull/4119))

### Changed

- Update base image for glibc Linux docker images ([PR #4100](https://github.com/ponylang/ponyc/pull/4100))
- Update LLVM to 14.0.3 ([PR #4055](https://github.com/ponylang/ponyc/pull/4055))
- Don't use "mostly debug runtime" with release configurations ([PR #4112](https://github.com/ponylang/ponyc/pull/4112))

## [0.50.0] - 2022-04-30

### Fixed

- Fix crash with exhaustive match and generics ([PR #4057](https://github.com/ponylang/ponyc/pull/4057))
- Fix parameter names not being checked ([PR #4061](https://github.com/ponylang/ponyc/pull/4061))
- Fix compiler crash in HeapToStack optimization pass ([PR #4067](https://github.com/ponylang/ponyc/pull/4067))
- Strengthen the ordering for some atomic operations ([PR #4083](https://github.com/ponylang/ponyc/pull/4083))
- Fix a runtime fault for Windows IOCP w/ memtrack messages. ([PR #4094](https://github.com/ponylang/ponyc/pull/4094))

### Added

- Allow to override the return type of FFI functions ([PR #4060](https://github.com/ponylang/ponyc/pull/4060))
- Add prebuilt ponyc releases for Ubuntu 22.04 ([PR #4097](https://github.com/ponylang/ponyc/pull/4097))

### Changed

- Don't allow FFI calls in default methods or behaviors ([PR #4065](https://github.com/ponylang/ponyc/pull/4065))

## [0.49.1] - 2022-03-13

### Fixed

- Ban unstable variables ([PR #4018](https://github.com/ponylang/ponyc/pull/4018))

## [0.49.0] - 2022-02-26

### Fixed

- Add workaround for compiler assertion failure in Promise.flatten_next ([PR #3991](https://github.com/ponylang/ponyc/pull/3991))
- Take exhaustive match into account when checking for field initialization ([PR #4006](https://github.com/ponylang/ponyc/pull/4006))
- Fix compiler crash related to using tuples as a generic constraint ([PR #4005](https://github.com/ponylang/ponyc/pull/4005))
- Fix incorrect "field not initialized" error with while/else ([PR #4009](https://github.com/ponylang/ponyc/pull/4009))
- Fix incorrect "field not initialized" error with try/else ([PR #4011](https://github.com/ponylang/ponyc/pull/4011))
- Fix compiler crash related to using tuples in a union as a generic constraint ([PR #4017](https://github.com/ponylang/ponyc/pull/4017))
- Fix incorrect code returned by ANSI.erase ([PR #4022](https://github.com/ponylang/ponyc/pull/4022))
- Fix the signature of Iter's map_stateful/map to not require ephemerals ([PR #4026](https://github.com/ponylang/ponyc/pull/4026))
- Use symbol table from definition scope when looking up references from default method bodies ([PR #4027](https://github.com/ponylang/ponyc/pull/4027))
- Fix LLVM IR verification error found via PonyCheck ([PR #4039](https://github.com/ponylang/ponyc/pull/4039))
- Fix failed initialization bug in Process Monitor ([PR #4043](https://github.com/ponylang/ponyc/pull/4043))

### Added

- Add LeastCommonMultiple and GreatestCommonDivisor to math package ([PR #4001](https://github.com/ponylang/ponyc/pull/4001))
- Add PonyCheck to standard library ([PR #4034](https://github.com/ponylang/ponyc/pull/4034))

### Changed

- Reimplement `with` ([PR #4024](https://github.com/ponylang/ponyc/pull/4024))
- Remove `logger` package from the standard library ([PR #4035](https://github.com/ponylang/ponyc/pull/4035))
- Rename `ponybench` to match standard naming conventions. ([PR #4033](https://github.com/ponylang/ponyc/pull/4033))
- Change the standard library pattern for object capabilities ([PR #4031](https://github.com/ponylang/ponyc/pull/4031))
- Update Windows version used as the base for Windows images ([PR #4044](https://github.com/ponylang/ponyc/pull/4044))
- Rename `ponytest` package to conform to naming standards ([PR #4032](https://github.com/ponylang/ponyc/pull/4032))

## [0.48.0] - 2022-02-08

### Fixed

- Fix runtime crash when tracing class iso containing struct val ([PR #3993](https://github.com/ponylang/ponyc/pull/3993))

### Added

- Add a pony primitive that exposes scheduler information ([PR #3984](https://github.com/ponylang/ponyc/pull/3984))
- Expose additional scheduler info via the runtime_info package ([PR #3988](https://github.com/ponylang/ponyc/pull/3988))
- Add additional methods to itertools ([PR #3992](https://github.com/ponylang/ponyc/pull/3992))

### Changed

- Stop creating prebuilt ponyc releases for Ubuntu 21.04 ([PR #3990](https://github.com/ponylang/ponyc/pull/3990))
- Revert "prevent non-opaque structs from being used as behaviour parameters" ([PR #3995](https://github.com/ponylang/ponyc/pull/3995))
- Update LLVM to 13.0.1 ([PR #3994](https://github.com/ponylang/ponyc/pull/3994))
- Remove out parameter from `pony_os_stdin_read` ([PR #4000](https://github.com/ponylang/ponyc/pull/4000))

## [0.47.0] - 2022-02-02

### Fixed

- Fix return checking in behaviours and constructors ([PR #3971](https://github.com/ponylang/ponyc/pull/3971))
- Fix issue that could lead to a muted actor being run ([PR #3974](https://github.com/ponylang/ponyc/pull/3974))
- Fix loophole that allowed interfaces to be used to violate encapsulation ([PR #3973](https://github.com/ponylang/ponyc/pull/3973))
- Fix compiler assertion failure when assigning error to a variable ([PR #3980](https://github.com/ponylang/ponyc/pull/3980))

### Added

- Add "nodoc" annotation ([PR #3978](https://github.com/ponylang/ponyc/pull/3978))

### Changed

- Remove simplebuiltin compiler option ([PR #3965](https://github.com/ponylang/ponyc/pull/3965))
- Remove library mode option from ponyc ([PR #3975](https://github.com/ponylang/ponyc/pull/3975))
- Change `builtin/AsioEventNotify` from an interface to a trait ([PR #3973](https://github.com/ponylang/ponyc/pull/3973))
- Don't allow interfaces to have private methods ([PR #3973](https://github.com/ponylang/ponyc/pull/3973))
- Remove hack that prevented documentation generation for "test classes" ([PR #3978](https://github.com/ponylang/ponyc/pull/3978))

## [0.46.0] - 2022-01-16

### Changed

- Stop creating CentOS 8 prebuilt ponyc releases ([PR #3955](https://github.com/ponylang/ponyc/pull/3955))
- Hide C header implementation details related to actor pad size. ([PR #3960](https://github.com/ponylang/ponyc/pull/3960))
- Change type of Env.root to AmbientAuth ([PR #3962](https://github.com/ponylang/ponyc/pull/3962))

## [0.45.2] - 2021-12-31

### Fixed

- Clarify wording for some subtyping errors ([PR #3933](https://github.com/ponylang/ponyc/pull/3933))
- Fix inability to fully build pony on Raspberry PI 4's with 64-bit Raspbian ([PR #3949](https://github.com/ponylang/ponyc/pull/3949))

### Added

- Add build instructions for 64-bit Raspbian ([PR #3880](https://github.com/ponylang/ponyc/pull/3880))

## [0.45.1] - 2021-12-02

### Fixed

- Fix underlying time source for Time.nanos() on macOS ([PR #3921](https://github.com/ponylang/ponyc/pull/3921))
- Fix `cli` package from mangling option arguments with equal signs ([PR #3925](https://github.com/ponylang/ponyc/pull/3925))

## [0.45.0] - 2021-11-01

### Fixed

- Fix erratic cycle detector triggering on some Arm systems ([PR #3854](https://github.com/ponylang/ponyc/pull/3854))
- Fix non-release build crashes on Arm ([PR #3860](https://github.com/ponylang/ponyc/pull/3860))
- Fix major source of runtime instability on non-x86 based platforms ([PR #3871](https://github.com/ponylang/ponyc/pull/3871))
- Fix segfaults with debug mode code on 64-bit Arm ([PR #3875](https://github.com/ponylang/ponyc/pull/3875))
- Fix incorrect version in nightly ponyc builds ([PR #3895](https://github.com/ponylang/ponyc/pull/3895))

### Added

- Add Ubuntu 21.04 nightly builds and releases builds ([PR #3866](https://github.com/ponylang/ponyc/pull/3866))
- Add 64-bit Arm (Graviton) as a supported platform ([PR #3876](https://github.com/ponylang/ponyc/pull/3876))
- Add build instructions for 32-bit Raspbian ([PR #3879](https://github.com/ponylang/ponyc/pull/3879))
- Add Apple Silicon as a supported platform ([PR #3883](https://github.com/ponylang/ponyc/pull/3883))

### Changed

- Remove options package ([PR #3844](https://github.com/ponylang/ponyc/pull/3844))
- Update to LLVM 13.0.0 ([PR #3837](https://github.com/ponylang/ponyc/pull/3837))

## [0.44.0] - 2021-09-03

### Fixed

- Fix a compile-time crash related to Pony-specific optimizations. ([PR #3831](https://github.com/ponylang/ponyc/pull/3831))

### Changed

- Update FilePath constructors to allow a non-partial way to create a FilePath ([PR #3819](https://github.com/ponylang/ponyc/pull/3819))

## [0.43.2] - 2021-08-28

### Fixed

- Clean up child process exits on Windows ([PR #3817](https://github.com/ponylang/ponyc/pull/3817))
- Cleanup and fixes for Windows sockets ([PR #3816](https://github.com/ponylang/ponyc/pull/3816))
- Stop standalone libponyc from needing zlib ([PR #3827](https://github.com/ponylang/ponyc/pull/3827))

## [0.43.1] - 2021-08-03

### Fixed

- Fixed Makefile for FreeBSD ([PR #3808](https://github.com/ponylang/ponyc/pull/3808))

### Added

- Add FileMode.u32 ([PR #3809](https://github.com/ponylang/ponyc/pull/3809))
- Add FileMode.u32 ([PR #3810](https://github.com/ponylang/ponyc/pull/3810))
- Make working with promises of promises easier  ([PR #3813](https://github.com/ponylang/ponyc/pull/3813))

## [0.43.0] - 2021-07-14

### Fixed

- Fix OOM on MacOS when using xcode 12.5 ([PR #3793](https://github.com/ponylang/ponyc/pull/3793))
- Fix MacOS version mismatch warnings when linking Pony programs ([PR #3798](https://github.com/ponylang/ponyc/pull/3798))
- Fix the calculation of "is prime" for numbers after 1321. ([PR #3799](https://github.com/ponylang/ponyc/pull/3799))
- Prevent non-opaque structs from being used as behaviour parameters ([PR #3781](https://github.com/ponylang/ponyc/pull/3781))

### Added

- Add support for prebuilt Rocky Linux versions ([PR #3783](https://github.com/ponylang/ponyc/pull/3783))

### Changed

- Update to LLVM 12.0.1 ([PR #3745](https://github.com/ponylang/ponyc/pull/3745))

## [0.42.0] - 2021-07-07

### Fixed

- Fix bug where Flags.remove could set flags in addition to unsetting them ([PR #3777](https://github.com/ponylang/ponyc/pull/3777))

### Added

- Allow Flags instances to be created with a set bit encoding ([PR #3778](https://github.com/ponylang/ponyc/pull/3778))

### Changed

- Don't allow PONYPATH to override standard library ([PR #3780](https://github.com/ponylang/ponyc/pull/3780))

## [0.41.2] - 2021-06-29

### Fixed

- Fix "iftype" expressions not being usable in lambdas or object literals ([PR #3763](https://github.com/ponylang/ponyc/pull/3763))
- Fix code generation for variadic FFI functions on arm64 ([PR #3768](https://github.com/ponylang/ponyc/pull/3768))

## [0.41.1] - 2021-05-22

### Fixed

- Fix NullablePointer type constraint check being omitted in FFI declarations ([PR #3758](https://github.com/ponylang/ponyc/pull/3758))

## [0.41.0] - 2021-05-07

### Fixed

- Change to Steed's model of subtyping ([PR #3643](https://github.com/ponylang/ponyc/pull/3643))
- Fix memory corruption with Array.chop and String.chop ([PR #3755](https://github.com/ponylang/ponyc/pull/3755))

### Changed

- Improve error message for match on structs ([PR #3746](https://github.com/ponylang/ponyc/pull/3746))
- RFC 68: Mandatory FFI declarations ([PR #3739](https://github.com/ponylang/ponyc/pull/3739))
- Change return type of String.add to String iso^ ([PR #3752](https://github.com/ponylang/ponyc/pull/3752))
- Improve error message on destructuring of non-tuple types ([PR #3753](https://github.com/ponylang/ponyc/pull/3753))

## [0.40.0] - 2021-05-01

### Fixed

- Use built-in offset argument to cpointer ([PR #3741](https://github.com/ponylang/ponyc/pull/3741))

### Added

- Add `IsPrime` checker to `math` package ([PR #3738](https://github.com/ponylang/ponyc/pull/3738))

### Changed

- Change supported FreeBSD to 13.0 ([PR #3743](https://github.com/ponylang/ponyc/pull/3743))

## [0.39.1] - 2021-03-29

### Fixed

- Fix compiler crash related to type parameter references ([PR #3725](https://github.com/ponylang/ponyc/pull/3725))
- Fix early pipe shutdown with Windows ProcessMonitor ([PR #3726](https://github.com/ponylang/ponyc/pull/3726))
- Fix literal inference through partial function ([PR #3729](https://github.com/ponylang/ponyc/pull/3729))

## [0.39.0] - 2021-02-27

### Fixed

- Fix calculation of # CPU cores (FreeBSD/DragonFly) ([PR #3707](https://github.com/ponylang/ponyc/pull/3707))
- Fix partial FFI declarations ignoring partial annotation ([PR #3713](https://github.com/ponylang/ponyc/pull/3713))
- Fix building ponyc on DragonFly BSD ([PR #3676](https://github.com/ponylang/ponyc/pull/3676))
- Fix symbol table patching for overriding default methods ([PR #3719](https://github.com/ponylang/ponyc/pull/3719))
- Fix tuple related compiler segfaults ([PR #3723](https://github.com/ponylang/ponyc/pull/3723))

### Added

- Create a standalone libponyc on Linux ([PR #3716](https://github.com/ponylang/ponyc/pull/3716))

### Changed

- Update supported FreeBSD to 12.2 ([PR #3706](https://github.com/ponylang/ponyc/pull/3706))

## [0.38.3] - 2021-01-29

### Fixed

- Fix memory safety problem with Array.from_cpointer ([PR #3675](https://github.com/ponylang/ponyc/pull/3675))
- Fix bad package names in generated documentation ([PR #3700](https://github.com/ponylang/ponyc/pull/3700))

## [0.38.2] - 2020-12-26

### Fixed

- Fix race conditions that can lead to a segfault ([PR #3667](https://github.com/ponylang/ponyc/pull/3667))
- Fix compiler crash when an if block ends with an assignment that has no result value. ([PR #3670](https://github.com/ponylang/ponyc/pull/3670))
- Fix link errors on macOS Big Sur ([PR #3686](https://github.com/ponylang/ponyc/pull/3686))
- Fix unhandled null pointer returning from os_addrinfo_intern ([PR #3687](https://github.com/ponylang/ponyc/pull/3687))

## [0.38.1] - 2020-09-26

### Fixed

- Fix race condition in cycle detector block sent handling ([PR #3666](https://github.com/ponylang/ponyc/pull/3666))

## [0.38.0] - 2020-09-24

### Fixed

- Fix build failure under GCC 10.2 ([PR #3630](https://github.com/ponylang/ponyc/pull/3630))
- Fix building libs with Visual Studio 16.7 ([PR #3635](https://github.com/ponylang/ponyc/pull/3635))
- Fix missing Makefile lines to re-enable multiple `use=` options ([PR #3637](https://github.com/ponylang/ponyc/pull/3637))
- Consistent handling of  function calls in consume expressions ([PR #3647](https://github.com/ponylang/ponyc/pull/3647))
- Speed up cycle detector reaping some actors ([PR #3649](https://github.com/ponylang/ponyc/pull/3649))
- Prevent compiler crashes on certain `consume` expressions ([PR #3650](https://github.com/ponylang/ponyc/pull/3650))
- Fix soundness problem with Array.chop ([PR #3657](https://github.com/ponylang/ponyc/pull/3657))
- Allow for building on DragonFlyBSD again ([PR #3654](https://github.com/ponylang/ponyc/pull/3654))

### Added

- Add prebuilt ponyc binaries for CentOS 8 ([PR #3629](https://github.com/ponylang/ponyc/pull/3629))
- Add prebuilt ponyc binaries for Ubuntu 20.04 ([PR #3632](https://github.com/ponylang/ponyc/pull/3632))
- Improvements to garbage collection of short-lived actors ([PR #3653](https://github.com/ponylang/ponyc/pull/3653))

### Changed

- Make Range.next() partial ([PR #3639](https://github.com/ponylang/ponyc/pull/3639))

## [0.37.0] - 2020-08-28

### Fixed

- Fix unsound return types being allowed for autorecover ([PR #3595](https://github.com/ponylang/ponyc/pull/3595))
- Fix compile error with GCC 8.3 ([PR #3618](https://github.com/ponylang/ponyc/pull/3618))
- Always allow field access for objects defined inside a recover block ([PR #3606](https://github.com/ponylang/ponyc/pull/3606))

### Changed

- Update to basing musl images off of Alpine 3.12 ([PR #3609](https://github.com/ponylang/ponyc/pull/3609))
- Revert "Implement RFC0067" ([PR #3619](https://github.com/ponylang/ponyc/pull/3619))

## [0.36.0] - 2020-07-31

### Fixed

- Compile fix for the latest MSVC compiler (MSVC 19.26.28806.0, from Visual Studio 16.6.2) ([PR #3576](https://github.com/ponylang/ponyc/pull/3576))
- Fix with expressions using tuple destructuring. ([PR #3586](https://github.com/ponylang/ponyc/pull/3586))
- Fix typeparam check endless recursion ([PR #3589](https://github.com/ponylang/ponyc/pull/3589))
- Force removing read-only files on Windows with `FilePath.remove()` ([PR #3588](https://github.com/ponylang/ponyc/pull/3588))

### Added

- Added vs2019 preview support for building ponyc ([PR #3587](https://github.com/ponylang/ponyc/pull/3587))
- Implement RFC 66: Iter maybe ([PR #3603](https://github.com/ponylang/ponyc/pull/3603))

### Changed

- Change trn->trn to box to fix a soundness hole ([PR #3591](https://github.com/ponylang/ponyc/pull/3591))
- Add LogLevel as argument to LogFormatter ([PR #3597](https://github.com/ponylang/ponyc/pull/3597))

## [0.35.1] - 2020-05-13

### Fixed

- Fix incorrect Windows process waiting ([PR #3559](https://github.com/ponylang/ponyc/pull/3559))

### Changed

- Rename FreeBSD artifacts ([PR #3556](https://github.com/ponylang/ponyc/pull/3556))

## [0.35.0] - 2020-05-11

### Fixed

- Fix CommandParser incorrectly handling multiple end-of-option delimiters ([PR #3541](https://github.com/ponylang/ponyc/pull/3541))
- Correctly report process termination status in ProcessNotify.dispose() ([PR #3419](https://github.com/ponylang/ponyc/pull/3419))
- Ensure non-blocking process wait and correctly report process exit status ([PR #3419](https://github.com/ponylang/ponyc/pull/3419))
- Fix atomics usage related to actor muting for ARM ([PR #3552](https://github.com/ponylang/ponyc/pull/3552))

### Added

- Add Ubuntu18.04 builds ([PR #3545](https://github.com/ponylang/ponyc/pull/3545))

### Changed

- Ensure that waiting on a child process when using ProcessMonitor is non-blocking ([PR #3419](https://github.com/ponylang/ponyc/pull/3419))

## [0.34.1] - 2020-05-07

### Fixed

- Fix unneeded dependency on Linux glibc systems ([PR #3538](https://github.com/ponylang/ponyc/pull/3538))

## [0.34.0] - 2020-05-03

### Added

- Build Docker images for windows builds ([PR #3492](https://github.com/ponylang/ponyc/pull/3492))
- Added support for VS Preview ([PR #3487](https://github.com/ponylang/ponyc/pull/3487))
- Add nightly FreeBSD 12.1 builds ([PR #3502](https://github.com/ponylang/ponyc/pull/3502))
- Add OSSockOpt constants added by Linux 5.1 kernel ([PR #3515](https://github.com/ponylang/ponyc/pull/3515))
- Add prebuilt FreeBSD 12.1 builds for releases ([PR #3525](https://github.com/ponylang/ponyc/pull/3525))

### Changed

- Build PonyC using CMake ([PR #3234](https://github.com/ponylang/ponyc/pull/3234))
- Update  supported FreeBSD version to 12.1 ([PR #3495](https://github.com/ponylang/ponyc/pull/3495))
- Make clang our default compiler on Linux, macOS, and FreeBSD ([PR #3506](https://github.com/ponylang/ponyc/pull/3506))
- schedule the cycle detector with higher priority using the inject queue ([PR #3507](https://github.com/ponylang/ponyc/pull/3507))
- Update glibc Docker image based to Ubuntu 20 ([PR #3522](https://github.com/ponylang/ponyc/pull/3522))
- Change supported Ubuntu version to Ubuntu 20 ([PR #3522](https://github.com/ponylang/ponyc/pull/3522))
- Let processmonitor chdir before exec ([PR #3530](https://github.com/ponylang/ponyc/pull/3530))
- Removed unused Unsupported error from ProcessMonitor([PR #3530](https://github.com/ponylang/ponyc/pull/3530))
- Update ProcessMonitor errors to contain error messages ([PR #3532](https://github.com/ponylang/ponyc/pull/3532))

## [0.33.2] - 2020-02-03

### Fixed

- fix cli issue when providing --help=false. ([PR #3442](https://github.com/ponylang/ponyc/pull/3442))
- Fix linker error when creating symlinks on Windows ([PR #3444](https://github.com/ponylang/ponyc/pull/3444))
- Fix "not match" and "not if" causing a syntax error ([PR #3449](https://github.com/ponylang/ponyc/pull/3449))

### Added

- LLVM 9.0.x support ([PR #3320](https://github.com/ponylang/ponyc/pull/3320))

### Changed

- Better error message for check_receiver_cap ([PR #3450](https://github.com/ponylang/ponyc/pull/3450))
- Improved error for undefined but used left side of declarations ([PR #3451](https://github.com/ponylang/ponyc/pull/3451))

## [0.33.1] - 2019-12-13

### Fixed

- Fix building ponyc with clang on Ubuntu ([PR #3378](https://github.com/ponylang/ponyc/pull/3378))
- Fix error using latest VS2019 to build ponyc ([PR #3369](https://github.com/ponylang/ponyc/pull/3369))

### Changed

- Update default LLVM 7.1.0 ([PR #3377](https://github.com/ponylang/ponyc/pull/3377))

## [0.33.0] - 2019-11-01

### Fixed

- Building ponyc with GCC 8+ ([PR #3345](https://github.com/ponylang/ponyc/pull/3345))

### Added

- Allow programmatic override of the default runtime options ([PR #3342](https://github.com/ponylang/ponyc/pull/3342))

### Changed

- `--ponythreads` has been renamed to `--ponymaxthreads` ([PR #3334](https://github.com/ponylang/ponyc/pull/3334))
- All `--pony*` options that accept a value, will be checked for minimal values ([PR #3303](https://github.com/ponylang/ponyc/pull/3317))
- Default to statically linking LLVM into ponyc ([PR #3355](https://github.com/ponylang/ponyc/pull/3355))

## [0.32.0] - 2019-09-29

### Added

- Allow fields to be `consume`d (sometimes) ([PR #3304](https://github.com/ponylang/ponyc/pull/3304))
- `--ponynoscale` option ([PR #3303](https://github.com/ponylang/ponyc/pull/3303))
- `--ponyhelp` option to compiled program ([PR #3312](https://github.com/ponylang/ponyc/pull/3312))

### Changed

- Rename MaybePointer to NullablePointer ([PR #3293](https://github.com/ponylang/ponyc/pull/3293))
- `--ponyminthreads` option can't be larger than `--ponythreads` ([PR #3303](https://github.com/ponylang/ponyc/pull/3303))
- `--ponythreads` option can't be larger than cores available ([PR #3303](https://github.com/ponylang/ponyc/pull/3303))

## [0.31.0] - 2019-08-31

### Fixed

- Fix static linking issue by changing the link order ([PR #3259](https://github.com/ponylang/ponyc/pull/3259))

### Added

- Add `--link-ldcmd` command line argument for overriding the `ld` command used for linking ([PR #3259](https://github.com/ponylang/ponyc/pull/3259))
- Make builds with `musl` on `glibc` systems possible ([PR #3263](https://github.com/ponylang/ponyc/pull/3263))
- Add `proxy_via(destination_host, destination_service)` to `TCPConnectionNotify` to allow TCP handlers to change the hostname & service from a TCPConnectionNotify before connecting ([PR #3230](https://github.com/ponylang/ponyc/pull/3230))
- Add `add` and `sub` to `collections/persistent/Map` ([PR #3275](https://github.com/ponylang/ponyc/pull/3275))

### Changed

- Remove unnecessary argument to `Map.sub` ([PR #3275](https://github.com/ponylang/ponyc/pull/3275))
- No longer supply AppImage as a release format ([PR #3288](https://github.com/ponylang/ponyc/pull/3288))

## [0.30.0] - 2019-07-27

### Fixed

- Fix `which dtrace` path check ([PR #3229](https://github.com/ponylang/ponyc/pull/3229))
- Fix segfault due to Cycle Detector viewref inconsistency ([PR #3254](https://github.com/ponylang/ponyc/pull/3254))

### Changed

- Make Map insertion functions total ([PR #3203](https://github.com/ponylang/ponyc/pull/3203))
- Stop building Tumbleweed packages for releases ([PR #3228](https://github.com/ponylang/ponyc/pull/3228))
- Stop creating Debian Buster releases ([PR #3227](https://github.com/ponylang/ponyc/pull/3227))
- Remove `glob` package from standard library ([PR #3220](https://github.com/ponylang/ponyc/pull/3220))
- Remove `regex` package from standard library ([PR #3218](https://github.com/ponylang/ponyc/pull/3218))
- Remove `crypto` package from standard library ([PR #3225](https://github.com/ponylang/ponyc/pull/3225))
- Remove `net/ssl` package from standard library ([PR #3225](https://github.com/ponylang/ponyc/pull/3225))

## [0.29.0] - 2019-07-06

### Fixed

- Do not permit leading zeros in JSON numbers ([PR #3167](https://github.com/ponylang/ponyc/pull/3167))
- Make reading via TCPConnection re-entrant safe ([PR #3175](https://github.com/ponylang/ponyc/pull/3175))
- Cleanup TCPConnection GC-safety mechanism for writev buffers ([PR #3177](https://github.com/ponylang/ponyc/pull/3177))
- Add SSL tests and fix some SSL related bugs ([PR #3174](https://github.com/ponylang/ponyc/pull/3174))
- Fix lib/llvm to support MacOS ([PR #3181](https://github.com/ponylang/ponyc/pull/3181))
- Close Denial of Service issue with TCPConnection.expect ([PR #3197](https://github.com/ponylang/ponyc/pull/3197))
- Fix return type checking to allow aliasing for non-ephemeral return types. ([PR #3201](https://github.com/ponylang/ponyc/pull/3201))

### Added

- Allow use of OpenSSL 1.1.1 when building Pony ([PR #3156](https://github.com/ponylang/ponyc/pull/3156))
- Add `pointer.offset` to get arbitrary pointer tags via offset ([PR #3177](https://github.com/ponylang/ponyc/pull/3177))
- Add DTrace/SystemTap probes for muted & unmuted events ([PR #3196](https://github.com/ponylang/ponyc/pull/3196))
- Add method to AsioEvent to see if an event is a oneshot ([PR #3198](https://github.com/ponylang/ponyc/pull/3198))

### Changed

- Do not permit leading zeros in JSON numbers ([PR #3167](https://github.com/ponylang/ponyc/pull/3167))
- Make TCPConnection yield on writes to not hog cpu ([PR #3176](https://github.com/ponylang/ponyc/pull/3176))
- Change how TCP connection reads data to improve performance ([PR #3178](https://github.com/ponylang/ponyc/pull/3178))
- Allow use of runtime TCP connect without ASIO one shot ([PR #3171](https://github.com/ponylang/ponyc/pull/3171))
- Simplify buffering in TCPConnection ([PR #3185](https://github.com/ponylang/ponyc/pull/3185))
- Allow for fine-grained control of yielding CPU in TCPConnection ([PR #3197](https://github.com/ponylang/ponyc/pull/3187))
- Make TCPConnection.expect partial ([PR #3197](https://github.com/ponylang/ponyc/pull/3197))

## [0.28.1] - 2019-06-01

### Fixed

- Don't turn off Epoll OneShot when resubscribing to events  ([PR #3136](https://github.com/ponylang/ponyc/pull/3136))
- Add unchop to array and unchop, repeat_str and mul to string ([PR #3155](https://github.com/ponylang/ponyc/pull/3155))
- Fix cycle detector issue with checking for blocked actors ([PR #3154](https://github.com/ponylang/ponyc/pull/3154))
- Wake up suspended scheduler threads if there is work for another one ([PR #3153](https://github.com/ponylang/ponyc/pull/3153))

### Added

- Add Docker image based on Alpine ([PR #3138](https://github.com/ponylang/ponyc/pull/3135))
- Added `XorOshiro128StarStar` and `SplitMix64` PRNGs. ([PR #3135](https://github.com/ponylang/ponyc/pull/3135))
- Added function `Random.int_unbiased`. ([PR #3135](https://github.com/ponylang/ponyc/pull/3135))
- Added `from_u64` constructor to 128 bit state PRNGs. ([PR #3135](https://github.com/ponylang/ponyc/pull/3135))
- Add unchop to array and unchop, repeat_str and mul to string ([PR #3155](https://github.com/ponylang/ponyc/pull/3155))

### Changed

- Updated `XorOshiro128Plus` parameters. This PRNG will now produce different values for the same seed as before. ([PR #3135](https://github.com/ponylang/ponyc/pull/3135))
- Use fixed-point inversion for `Random.int` if the platform allows. ([PR #3135](https://github.com/ponylang/ponyc/pull/3135))

## [0.28.0] - 2019-03-22

### Fixed

- Ensure methods reached through a union are detected as reachable. ([PR #3102](https://github.com/ponylang/ponyc/pull/3102))
- Fixed issue with ponyc not being able to find Visual Studio Build Tools in non-standard locations. ([PR #3086](https://github.com/ponylang/ponyc/pull/3086))
- Update TCPConnection docs around local and remote addresses ([PR #3050](https://github.com/ponylang/ponyc/pull/3050))

### Changed

- Stop Supporting Ubuntu Artful ([PR #3100](https://github.com/ponylang/ponyc/pull/3100))
- Upgrade Docker image to use LLVM 7.0.1 ([PR #3079](https://github.com/ponylang/ponyc/pull/3079))
- Stop trying to be clever when finding user's LLVM installation ([PR #3077](https://github.com/ponylang/ponyc/pull/3077))
- Stop supporting Ubuntu Trusty ([PR #3076](https://github.com/ponylang/ponyc/pull/3076))
- Stop supporting Debian Jessie ([PR #3078](https://github.com/ponylang/ponyc/pull/3078))

## [0.27.0] - 2019-03-01

### Fixed

- Fix default arguments not being displayed correctly in generated docs ([PR #3018](https://github.com/ponylang/ponyc/pull/3018))
- Fix linker library version error on MacOS when installed via Homebrew ([PR #2998](https://github.com/ponylang/ponyc/pull/2998))
- Correctly specify linkage on Windows for runtime library backpressure functions. ([PR #2989](https://github.com/ponylang/ponyc/pull/2989))
- Reject Pointer and MaybePointer from being embedded ([PR #3006](https://github.com/ponylang/ponyc/pull/3006))

### Added

- Add FreeBSD 12 with LLVM 7 as supported platform ([PR #3039](https://github.com/ponylang/ponyc/pull/3039))
- Windows implementation of Process and Pipe. ([PR #3019](https://github.com/ponylang/ponyc/pull/3019))
- LLVM 7.0.1 compatibility ([PR #2976](https://github.com/ponylang/ponyc/pull/2976))
- [RFC 61] Add Modulo Operator (and floored division) ([PR #2997](https://github.com/ponylang/ponyc/pull/2997))
- Update Windows build system to handle the latest Visual Studio 2017 version ([PR #2992](https://github.com/ponylang/ponyc/pull/2992))

### Changed

- make String.f32() and String.f64() partial ([PR #3043](https://github.com/ponylang/ponyc/pull/3043))
- Change `--ponyminthreads` default to `0` ([PR #3020](https://github.com/ponylang/ponyc/pull/3020))
- Change default to disable pinning of scheduler threads to CPU cores ([PR #3024](https://github.com/ponylang/ponyc/pull/3024))
- Fix linker library version error on MacOS when installed via Homebrew ([PR #2998](https://github.com/ponylang/ponyc/pull/2998))

## [0.26.0] - 2019-01-25

### Fixed

- Fix signed/unsigned conversion bug in siphash24 implementation ([PR #2979](https://github.com/ponylang/ponyc/pull/2979))
- Fixes for telemetry.stp script ([PR #2983](https://github.com/ponylang/ponyc/pull/2983))
- libponyc: resolve relative paths in use "path:..." statements ([PR #2964](https://github.com/ponylang/ponyc/pull/2964))
- Fix silent crash with incorrect time formats in Windows ([PR #2971](https://github.com/ponylang/ponyc/pull/2971))
- Add whitespace between multiple args on cli help output ([PR #2942](https://github.com/ponylang/ponyc/pull/2942))
- Fix unsafe cases in capability subtyping implementation ([PR #2660](https://github.com/ponylang/ponyc/pull/2660))
- Fix race condition with socket close event from peer ([PR #2923](https://github.com/ponylang/ponyc/pull/2923))
- Link to libexecinfo on BSD always, not just in a debug compiler ([PR #2916](https://github.com/ponylang/ponyc/pull/2916))
- Install libdtrace_probes.a into the right directory on FreeBSD ([PR #2919](https://github.com/ponylang/ponyc/pull/2919))
- Fix scheduler thread wakeup bug ([PR #2926](https://github.com/ponylang/ponyc/pull/2926))
- Correct README.md link to AppImage packaging location ([PR #2927](https://github.com/ponylang/ponyc/pull/2927))
- Fix unsoundness when replacing `this` viewpoint in method calls. ([PR #2503](https://github.com/ponylang/ponyc/pull/2503))

### Added

- [RFC 60] Add binary heaps ([PR #2950](https://github.com/ponylang/ponyc/pull/2950))
- Make _SignedInteger and _UnsignedInteger public ([PR #2939](https://github.com/ponylang/ponyc/pull/2939))

### Changed

- Fix silent crash with incorrect time formats in Windows ([PR #2971](https://github.com/ponylang/ponyc/pull/2971))
- Add before/after iteration hooks to ponybench ([PR #2898](https://github.com/ponylang/ponyc/pull/2898))

## [0.25.0] - 2018-10-13

### Fixed

- Fix invalid allocation bug in runtime that allows for segfaults ([PR #2896](https://github.com/ponylang/ponyc/pull/2896))
- `buffered` performance improvements and bug fix ([PR #2890](https://github.com/ponylang/ponyc/pull/2890))
- Fix hash collision handling in persistent map ([PR #2894](https://github.com/ponylang/ponyc/pull/2894))
- Correctly handle modifier keys for TTY stdin on Windows ([PR #2892](https://github.com/ponylang/ponyc/pull/2892))
- Fix installation of libponyrt.bc on Linux ([PR #2893](https://github.com/ponylang/ponyc/pull/2893))
- Fix compilation warning on windows. ([PR #2877](https://github.com/ponylang/ponyc/pull/2877))
- Fix building on Windows in a directory with spaces in its name ([PR #2879](https://github.com/ponylang/ponyc/pull/2879))
- Fix losing data when reading from STDIN. ([PR #2872](https://github.com/ponylang/ponyc/pull/2872))
- Fix validation of provides lists of object literals. ([PR #2860](https://github.com/ponylang/ponyc/pull/2860))
- Fix `files/Path.clean()` not correctly handling multiple `..` ([PR #2862](https://github.com/ponylang/ponyc/pull/2862))
- Fix skipped try-then clauses on return, break and continue statements ([PR #2853](https://github.com/ponylang/ponyc/pull/2853))
- Fix performance and memory consumption issues with `files.FileLines` ([PR #2707](https://github.com/ponylang/ponyc/pull/2707))
- Fix ASIO one shot lost notifications problem ([PR #2897](https://github.com/ponylang/ponyc/pull/2897))

### Added

- Add ability to get iso array from an iso string. ([PR #2889](https://github.com/ponylang/ponyc/pull/2889))
- Add modc method to integer types ([PR #2883](https://github.com/ponylang/ponyc/pull/2883))
- Add divc method to integer types ([PR #2882](https://github.com/ponylang/ponyc/pull/2882))
- [RFC 58] Add partial arithmetic for integer types ([PR #2865](https://github.com/ponylang/ponyc/pull/2865))
- Added OpenBSD support. ([PR #2823](https://github.com/ponylang/ponyc/pull/2823))
- Added `set_up` method to `ponytest.UnitTest` as equivalent to existing `tear_down` method ([PR #2707](https://github.com/ponylang/ponyc/pull/2707))
- Added `keep_line_breaks` argument to function `buffered.Reader.line` ([PR #2707](https://github.com/ponylang/ponyc/pull/2707))

### Changed

- Rename mod and related operators to rem ([PR #2888](https://github.com/ponylang/ponyc/pull/2888))
- Improved CHAMP map ([PR #2894](https://github.com/ponylang/ponyc/pull/2894))
- Use RLIMIT_STACK's current limit for Pthreads stack size if it is sane ([PR #2852](https://github.com/ponylang/ponyc/pull/2852))
- Remove `File.line` method in favor of using `FileLines` ([PR #2707](https://github.com/ponylang/ponyc/pull/2707))

## [0.24.4] - 2018-07-29

### Fixed

- Fix array and string trim_in_place allocation bounds check ([PR #2840](https://github.com/ponylang/ponyc/pull/2840))

## [0.24.3] - 2018-07-24

### Added

- Nothing - this was purely to fix a problem in the previously release

## [0.24.2] - 2018-07-24

### Fixed

- Fix `make arch=XXXXX` command to be able to correctly find libponyrt.

## [0.24.1] - 2018-07-22

### Fixed

- Add libexecinfo to debug builds for BSD ([PR #2826](https://github.com/ponylang/ponyc/pull/2826))

### Added

- Add SSL APLN support ([PR #2816](https://github.com/ponylang/ponyc/pull/2816))
- Make dynamic scheduler scaling more robust and configurable ([PR #2801](https://github.com/ponylang/ponyc/pull/2801))

## [0.24.0] - 2018-06-29

### Fixed

- Always use "binary" mode when opening files on Windows. ([PR #2811](https://github.com/ponylang/ponyc/pull/2811))
- Do not set File._errno when reading less than requested bytes. ([PR #2785](https://github.com/ponylang/ponyc/pull/2785))
- Correctly allocate memory for linker arguments ([PR #2797](https://github.com/ponylang/ponyc/pull/2797))
- Fix build on DragonFly BSD ([PR #2794](https://github.com/ponylang/ponyc/pull/2794))
- Fix some edge cases in code generation for loops that jump away. ([PR #2791](https://github.com/ponylang/ponyc/pull/2791))
- Fix repeat loop symbol tracking to allow more valid cases. ([PR #2786](https://github.com/ponylang/ponyc/pull/2786))
-  Fix incorrect disposable/destroyed epoll resubscribe handling ([PR #2781](https://github.com/ponylang/ponyc/pull/2781))
- Fix GC-safety issue with writev pointers in File. ([PR #2775](https://github.com/ponylang/ponyc/pull/2775))
- Disable neon for armhf if not supported by C/C++ compiler ([PR #2672](https://github.com/ponylang/ponyc/pull/2672))

### Changed

- Run cycle detector every N ms based on timer ([PR #2709](https://github.com/ponylang/ponyc/pull/2709))
- [RFC 55] Remove package net/http from stdlib ([PR #2795](https://github.com/ponylang/ponyc/pull/2795))
- Change refcap of JsonDoc to ref for better usability ([PR #2747](https://github.com/ponylang/ponyc/pull/2747))
- Change NetAddress class to hide its fields behind functions, fixing cross-platform compatibility. ([PR #2734](https://github.com/ponylang/ponyc/pull/2734))

## [0.23.0] - 2018-06-10

### Fixed

- Fix File.writev and File.flush in cases where the IO vector exceeds IOV_MAX. ([PR #2771](https://github.com/ponylang/ponyc/pull/2771))
- Fix incorrect tuple handling ([PR #2763](https://github.com/ponylang/ponyc/pull/2763))
- Fix Promise bug where join() element's reject doesn't reject the entire join ([PR #2770](https://github.com/ponylang/ponyc/pull/2770))

### Added

- Add Integer.bit_reverse, exposing the llvm.bitreverse intrinsic. ([PR #2710](https://github.com/ponylang/ponyc/pull/2710))

### Changed

- RFC 56: Make buffered.reader.line return String iso^ ([PR #2756](https://github.com/ponylang/ponyc/pull/2756))

## [0.22.6] - 2018-06-07

### Fixed

- Fix compiler segfault caused by dead code removal of tupled variables ([PR #2757](https://github.com/ponylang/ponyc/pull/2757))
- Fix `collections/persistent/Lists.from()` to return elements in the correct order ([PR #2754](https://github.com/ponylang/ponyc/pull/2754))
- Fix performance related to dynamic scheduler scaling ([PR #2751](https://github.com/ponylang/ponyc/pull/2751))
- Fix incorrect disposable/destroyed epoll resubscribe handling ([PR #2744](https://github.com/ponylang/ponyc/pull/2744))
- Fix performance regression in serialization performance ([PR #2752](https://github.com/ponylang/ponyc/pull/2752))

## [0.22.5] - 2018-06-05

### Fixed

- Fix memory overflow when allocating CPUs when numa is enabled ([PR #2745](https://github.com/ponylang/ponyc/pull/2745))

## [0.22.4] - 2018-06-04

### Fixed

- Fix compiler crash related to union types with duplicate members. ([PR #2738](https://github.com/ponylang/ponyc/pull/2738))
- Fix CommandSpec without args and help ([PR #2721](https://github.com/ponylang/ponyc/pull/2721))

## [0.22.3] - 2018-05-31

### Fixed

- Only enable mcx16 for gcc for x86_64 targets ([PR #2725](https://github.com/ponylang/ponyc/pull/2725))
- Fix String.concat ignoring the len parameter ([PR #2723](https://github.com/ponylang/ponyc/pull/2723))

## [0.22.2] - 2018-05-26

### Fixed

- Relax ProcessMonitor checks for execute bits ([PR #2717](https://github.com/ponylang/ponyc/pull/2717))

## [0.22.1] - 2018-05-25

### Fixed

- Broken docker image creation

## [0.22.0] - 2018-05-24

### Fixed

- Incorrect rstrip handling of multibyte characters ([PR #2706](https://github.com/ponylang/ponyc/pull/2706))
- Fix File.flush return value for case of zero bytes to flush. ([PR #2704](https://github.com/ponylang/ponyc/pull/2704))
- Enable virtual terminal color output on Windows. ([PR #2702](https://github.com/ponylang/ponyc/pull/2702))
- Compute File.writeable based on FileWrite instead of FileRead. ([PR #2698](https://github.com/ponylang/ponyc/pull/2698))
- Do not use llvm.smul.with.overflow.i64 anymore ([PR #2693](https://github.com/ponylang/ponyc/pull/2693))
- Change directory.open_file() to use readonly open ([PR #2697](https://github.com/ponylang/ponyc/pull/2697))
- Avoid flattening arrow to type param, fixing typechecking when reified with another type param. ([PR #2692](https://github.com/ponylang/ponyc/pull/2692))
- Fix File.valid() and clarify File behavior in error cases ([PR #2656](https://github.com/ponylang/ponyc/pull/2656))
- Fix tuple pattern matching issue where only some elements would violate caps. ([PR #2658](https://github.com/ponylang/ponyc/pull/2658))
- Fix scheduler suspend edge case assertion ([PR #2641](https://github.com/ponylang/ponyc/pull/2641))
- Fix code generation failure with tuples in recover blocks ([PR #2642](https://github.com/ponylang/ponyc/pull/2642))
- Do not mute sender if sender is under pressure ([PR #2644](https://github.com/ponylang/ponyc/pull/2644))
- Fix FilePath.walk performance issues (issue #2158). ([PR #2634](https://github.com/ponylang/ponyc/pull/2634))
- Fix backpressure-related TCPConnection busy-loop bug (issue #2620). ([PR #2627](https://github.com/ponylang/ponyc/pull/2627))
- Fix off-by-one error in String.cstring ([PR #2616](https://github.com/ponylang/ponyc/pull/2616))
- Fix compiler crash related to array inference. ([PR #2603](https://github.com/ponylang/ponyc/pull/2603))
- Ensure ASIO thread cannot be stopped prematurely ([PR #2612](https://github.com/ponylang/ponyc/pull/2612))
- Handle EAGAIN errors on socket operations ([PR #2611](https://github.com/ponylang/ponyc/pull/2611))
- Properly report type parameter capability errors ([PR #2598](https://github.com/ponylang/ponyc/pull/2598))
- Update the Windows build to support the latest Visual C++ Build Tools ([PR #2594](https://github.com/ponylang/ponyc/pull/2594))
- Fix tracing of boxed tuples through interfaces ([PR #2593](https://github.com/ponylang/ponyc/pull/2593))
- Partially mitigate LLVM's infinite loops bug ([PR #2592](https://github.com/ponylang/ponyc/pull/2592))
- Fix extracting docstring from constructors ([PR #2586](https://github.com/ponylang/ponyc/pull/2586))
- Always unsubscribe process_monitor fds before closing them (#2529) ([PR #2574](https://github.com/ponylang/ponyc/pull/2574))
- Fix two race conditions where an ASIO wakeup notifications can be lost ([PR #2561](https://github.com/ponylang/ponyc/pull/2561))
- Fix compiler crash in alternate name suggestion logic (issue #2508). ([PR #2552](https://github.com/ponylang/ponyc/pull/2552))
- Make the File.open constructor use read-only mode (Issue #2567) ([PR #2568](https://github.com/ponylang/ponyc/pull/2568))
- Correctly typecheck FFI arguments with regard to aliasing ([PR #2550](https://github.com/ponylang/ponyc/pull/2550))
- Allow tuples to match empty interfaces ([PR #2532](https://github.com/ponylang/ponyc/pull/2532))
- Properly report default argument inference errors ([PR #2504](https://github.com/ponylang/ponyc/pull/2504))
- Do not catch foreign exceptions in Pony try blocks. This still doesn't work on Windows, foreign code doesn't catch foreign exceptions if they've traversed a Pony frame. ([PR #2466](https://github.com/ponylang/ponyc/pull/2466))
- Fix LLVM IR verification with DoNotOptimise ([PR #2506](https://github.com/ponylang/ponyc/pull/2506))

### Added

- Add addc, subc and mulc functions to I128 and U128 ([PR #2645](https://github.com/ponylang/ponyc/pull/2645))
- Add mechanism to register (noisy) signal handler ([PR #2631](https://github.com/ponylang/ponyc/pull/2631))
- Added `nosupertype` annotation for subtyping exclusion (RFC 54). ([PR #2678](https://github.com/ponylang/ponyc/pull/2678))
- `SourceLoc.type_name` method ([PR #2643](https://github.com/ponylang/ponyc/pull/2643))
- Update with experimental support for LLVM 6.0.0 ([PR #2595](https://github.com/ponylang/ponyc/pull/2595))
- Improve pattern matching error reporting ([PR #2628](https://github.com/ponylang/ponyc/pull/2628))
- Allow recovering at most one element of a tuple to mutable capability. ([PR #2585](https://github.com/ponylang/ponyc/pull/2585))
- Add full'ish support for network socket get & set options ([PR #2513](https://github.com/ponylang/ponyc/pull/2513))
- Add basic compiler plugins ([PR #2566](https://github.com/ponylang/ponyc/pull/2566))
- [RFC 50] add member docstrings ([PR #2543](https://github.com/ponylang/ponyc/pull/2543))
- Allow user defined help string at CommandSpec.add_help() ([PR #2535](https://github.com/ponylang/ponyc/pull/2535))
- Embed source code into generated documentation. ([PR #2439](https://github.com/ponylang/ponyc/pull/2439))
- Compile error when comparing sugared constructors with 'is' or 'isnt' (#2024) ([PR #2494](https://github.com/ponylang/ponyc/pull/2494))
- Support OpenSSL 1.1.0 ([PR #2415](https://github.com/ponylang/ponyc/pull/2415))
- Add U64 type to `cli` package. ([PR #2488](https://github.com/ponylang/ponyc/pull/2488))
- Allow customisation of `Env.input` and `Env.exitcode` in artificial environments
- `hash64()` function and related helper types in `collections` for 64-bit hashes ([PR #2615](https://github.com/ponylang/ponyc/pull/2615))

### Changed

- `SourceLoc.method` renamed as `SourceLoc.method_name` method ([PR #2643](https://github.com/ponylang/ponyc/pull/2643))
- New Ponybench API (RFC 52) ([PR #2578](https://github.com/ponylang/ponyc/pull/2578))
- Forbid impossible pattern matching on generic capabilities ([PR #2499](https://github.com/ponylang/ponyc/pull/2499))
- Remove case functions ([PR #2542](https://github.com/ponylang/ponyc/pull/2542))
- Rename Date to PosixDate ([PR #2436](https://github.com/ponylang/ponyc/pull/2436))
- Fix and re-enable dynamic scheduler scaling ([PR #2483](https://github.com/ponylang/ponyc/pull/2483))
- Expose OutStream rather than StdStream in Env ([PR #2463](https://github.com/ponylang/ponyc/pull/2463))
- Rename StdinNotify to InputNotify
- `digestof` and `hash()` now return USize instead of U64 ([PR #2615](https://github.com/ponylang/ponyc/pull/2615))

## [0.21.3] - 2018-01-14

### Fixed

- Fix pthread condition variable usage for dynamic scheduler scaling ([PR #2472](https://github.com/ponylang/ponyc/pull/2472))
- Fix various memory leaks ([PR #2479](https://github.com/ponylang/ponyc/pull/2479))
- Fix double free in expr_typeref ([PR #2467](https://github.com/ponylang/ponyc/pull/2467))
- Fix some spurious process manager test failures ([PR #2452](https://github.com/ponylang/ponyc/pull/2452))
- Fix ANTLR definition for char escape sequences ([PR #2440](https://github.com/ponylang/ponyc/pull/2440))

### Added

- Add the pony_try function to receive Pony errors in C code ([PR #2457](https://github.com/ponylang/ponyc/pull/2457))

### Changed

- Disable -avx512f on LLVM < 5.0.0 to avoid LLVM bug 30542 ([PR #2475](https://github.com/ponylang/ponyc/pull/2475))
- Deprecate LLVM 3.7.1 and 3.8.1 support ([PR #2461](https://github.com/ponylang/ponyc/pull/2461))

## [0.21.2] - 2017-12-26

### Fixed

- Don't suspend schedulers if terminating and reset steal_attempts on wake ([PR #2447](https://github.com/ponylang/ponyc/pull/2447))

## [0.21.1] - 2017-12-23

### Added

- Dynamic scheduler thread scaling based on workload ([PR #2386](https://github.com/ponylang/ponyc/pull/2386))
- Support setting the binary executable name with `--bin-name`. ([PR #2430](https://github.com/ponylang/ponyc/pull/2430))

## [0.21.0] - 2017-12-17

### Fixed

- Forbid structs with embed fields with finalisers ([PR #2420](https://github.com/ponylang/ponyc/pull/2420))
- Fix codegen ordering of implicit finalisers ([PR #2419](https://github.com/ponylang/ponyc/pull/2419))
- Fix GC tracing of struct fields ([PR #2418](https://github.com/ponylang/ponyc/pull/2418))
- Remove redundant error message for unhandled partial calls that are actually in a try block. ([PR #2411](https://github.com/ponylang/ponyc/pull/2411))
- Fix allocation sizes in runtime benchmarks ([PR #2383](https://github.com/ponylang/ponyc/pull/2383))
- Fail pony_start if ASIO backend wasn't successfully initialized ([PR #2381](https://github.com/ponylang/ponyc/pull/2381))
- Make windows sleep consistent with non-windows sleep ([PR #2382](https://github.com/ponylang/ponyc/pull/2382))
- Fix Iter.{skip,take,nth} to check '.has_next()' of their inner iterator ([PR #2377](https://github.com/ponylang/ponyc/pull/2377))
- Restart ASIO if needed while runtime is attempting to terminate. ([PR #2373](https://github.com/ponylang/ponyc/pull/2373))
- fix Range with negative or 0 step and allow backward Ranges (having `min > max`) ([PR #2350](https://github.com/ponylang/ponyc/pull/2350))
- Improve work-stealing "scheduler is blocked" logic ([PR #2355](https://github.com/ponylang/ponyc/pull/2355))
- Make take_while short-circuit ([PR #2358](https://github.com/ponylang/ponyc/pull/2358))
- Fix compilation error with 'use=dtrace' for FreeBSD 11 ([PR #2343](https://github.com/ponylang/ponyc/pull/2343))
- Fix Set.intersect ([PR #2361](https://github.com/ponylang/ponyc/pull/2361))
-  Fixed state handling of HTTP client connections ([PR #2273](https://github.com/ponylang/ponyc/pull/2273))
- Fix incorrect detection of exhaustive matches for structural equality comparisons on some primitives. ([PR #2342](https://github.com/ponylang/ponyc/pull/2342))
- Fix poor randomness properties of first call to `Rand.next()`. ([PR #2321](https://github.com/ponylang/ponyc/pull/2321))
- Fully close unspecified family TCP connections on Windows. ([PR #2325](https://github.com/ponylang/ponyc/pull/2325))
- Make ContentsLogger implement the Logger interface ([PR #2330](https://github.com/ponylang/ponyc/pull/2330))
- Fix alloc bug in String/Array trimming functions ([PR #2336](https://github.com/ponylang/ponyc/pull/2336))
- Fix small chunk finaliser premature re-use bug ([PR #2335](https://github.com/ponylang/ponyc/pull/2335))
- Make Payload.respond() send given parameter, not `this`. ([PR #2324](https://github.com/ponylang/ponyc/pull/2324))
- Garbage collect actors when --ponynoblock is in use ([PR #2307](https://github.com/ponylang/ponyc/pull/2307))
- Fix incorrect kevent structure size ([PR #2312](https://github.com/ponylang/ponyc/pull/2312))
- Fix possible repetition in Iter.flat_map ([PR #2304](https://github.com/ponylang/ponyc/pull/2304))

### Added

- Add DTrace probes for all message push and pop operations ([PR #2295](https://github.com/ponylang/ponyc/pull/2295))
- Experimental support for LLVM 4.0.1 (#1592) and 5.0.0. ([PR #2303](https://github.com/ponylang/ponyc/pull/2303))
- Add pony stable to docker image ([PR #2364](https://github.com/ponylang/ponyc/pull/2364))
- Enable CodeView debug information with MSVC on Windows ([PR #2334](https://github.com/ponylang/ponyc/pull/2334))
- Generalized runtime backpressure. ([PR #2264](https://github.com/ponylang/ponyc/pull/2264))
- A microbenchmark for measuring message passing rates in the Pony runtime. ([PR #2347](https://github.com/ponylang/ponyc/pull/2347))
- Add `chop` function for chopping `iso` Strings and Arrays ([PR #2337](https://github.com/ponylang/ponyc/pull/2337))
- Add --ponyversion option to compiled binary ([PR #2318](https://github.com/ponylang/ponyc/pull/2318))
- Implement RFC 47 (Serialise signature) ([PR #2272](https://github.com/ponylang/ponyc/pull/2272))

### Changed

- Remove unused FormatSettings interface and related types. ([PR #2397](https://github.com/ponylang/ponyc/pull/2397))
- Error on unreachable cases in match expressions and illegal as expressions. ([PR #2289](https://github.com/ponylang/ponyc/pull/2289))

## [0.20.0] - 2017-10-17

### Fixed

- Forbid single '_' in case expr and case methods ([PR #2269](https://github.com/ponylang/ponyc/pull/2269))

### Changed

- Turn off LTO by default on OSX ([PR #2284](https://github.com/ponylang/ponyc/pull/2284))
- Replace memory-leak-inciting `Writer.reserve` with more intuitive `Writer.reserve_current` method. ([PR #2260](https://github.com/ponylang/ponyc/pull/2260))

## [0.19.3] - 2017-10-09

### Fixed

- Don't verify partial calls for method bodies inherited from a trait. ([PR #2261](https://github.com/ponylang/ponyc/pull/2261))
- Fix broken method and type headings in generated documentation ([PR #2262](https://github.com/ponylang/ponyc/pull/2262))
- Fix array inference from ReadSeq interface with tuple element type. ([PR #2259](https://github.com/ponylang/ponyc/pull/2259))
- Fix compiler crash related to inferred lambda argument in apply sugar. ([PR #2258](https://github.com/ponylang/ponyc/pull/2258))
- Fix excess work stealing under low loads ([PR #2254](https://github.com/ponylang/ponyc/pull/2254))
- Fix compiler crash on case methods with `_` as a method parameter. ([PR #2252](https://github.com/ponylang/ponyc/pull/2252))
- Fix implicit fallthrough in array inference. ([PR #2251](https://github.com/ponylang/ponyc/pull/2251))
- Fix small chunk finaliser bug. ([PR #2257](https://github.com/ponylang/ponyc/pull/2257))

## [0.19.2] - 2017-09-24

### Fixed

- Fix codegen failure on field access ([PR #2244](https://github.com/ponylang/ponyc/pull/2244))
- Make Windows link step use the command-line `--linker` value if present. ([PR #2231](https://github.com/ponylang/ponyc/pull/2231))
- Fix empty string serialisation ([PR #2247](https://github.com/ponylang/ponyc/pull/2247))

### Added

- Added Array.swap_elements, Random.shuffle and extends Random with methods for generating all Integer types (RFC 46). ([PR #2128](https://github.com/ponylang/ponyc/pull/2128))

## [0.19.1] - 2017-09-14

### Fixed

- Fix broken "make" command ([PR #2220](https://github.com/ponylang/ponyc/pull/2220))
- Fix inconsistencies in multi-line triple-quoted strings ([PR #2221](https://github.com/ponylang/ponyc/pull/2221))
- Fix undersized string buffer for library link command in Windows. ([PR #2223](https://github.com/ponylang/ponyc/pull/2223))
- Fix Iter.take to handle infinite iterator ([PR #2212](https://github.com/ponylang/ponyc/pull/2212))
- Fix handling of empty and multi-byte character literals ([PR #2214](https://github.com/ponylang/ponyc/pull/2214))

### Added

- Inference of lambda type and array element type from an antecedent (RFC 45). ([PR #2168](https://github.com/ponylang/ponyc/pull/2168))

## [0.19.0] - 2017-09-02

### Fixed

- Fix codegen failures on incompatible FFI declarations ([PR #2205](https://github.com/ponylang/ponyc/pull/2205))
- Disallow named arguments for methods of a type union where parameter names differ ([PR #2194](https://github.com/ponylang/ponyc/pull/2194))
- Fix compiler crash on illegal read from '_' ([PR #2201](https://github.com/ponylang/ponyc/pull/2201))
- Fix signals on Sierra ([PR #2195](https://github.com/ponylang/ponyc/pull/2195))
- Fix race condition in kqueue event system implementation ([PR #2193](https://github.com/ponylang/ponyc/pull/2193))

### Added

- `pony_chain` runtime function

### Changed

- The `pony_sendv` and `pony_sendv_single` runtime functions now take a message chain instead of a single message
- Improve the itertools API (RFC 49) ([PR #2190](https://github.com/ponylang/ponyc/pull/2190))
- Forbid struct finalisers ([PR #2202](https://github.com/ponylang/ponyc/pull/2202))

## [0.18.1] - 2017-08-25

### Fixed

- Don't print capabilities for type params when generating docs ([PR #2184](https://github.com/ponylang/ponyc/pull/2184))

### Added

- DragonFly BSD 4.8 support ([PR #2183](https://github.com/ponylang/ponyc/pull/2183))
- Process monitor async write buffering ([PR #2186](https://github.com/ponylang/ponyc/pull/2186))

## [0.18.0] - 2017-08-19

### Fixed

- Fix compiler crash on union-of-tuples to tuple conversions ([PR #2176](https://github.com/ponylang/ponyc/pull/2176))
- Fix compiler error on lambda capture of '_' ([PR #2171](https://github.com/ponylang/ponyc/pull/2171))
- Fix read past the end of a buffer in `pool.c`. ([PR #2139](https://github.com/ponylang/ponyc/pull/2139))

### Changed

- Make actor continuations a build time option ([PR #2179](https://github.com/ponylang/ponyc/pull/2179))
- RFC #48 Change String.join to take Iterable ([PR #2159](https://github.com/ponylang/ponyc/pull/2159))
- Change fallback linker to "gcc" from "gcc-6" on Linux. ([PR #2166](https://github.com/ponylang/ponyc/pull/2166))
- Change the signature of `pony_continuation` and `pony_triggergc` to take a `pony_ctx_t*` instead of a `pony_actor_t*`.

## [0.17.0] - 2017-08-05

### Fixed

- Fix cursor location for displaying compiler errors and info. ([PR #2136](https://github.com/ponylang/ponyc/pull/2136))
- Fix indent detection when lexing docstrings that contain whitespace-only lines. ([PR #2131](https://github.com/ponylang/ponyc/pull/2131))
- Fix compiler crash on typecheck error in FFI call. ([PR #2124](https://github.com/ponylang/ponyc/pull/2124))
- Fix compiler assert on match including structural equality on union type. ([PR #2117](https://github.com/ponylang/ponyc/pull/2117))

### Added

- Support GCC7 on Linux ([PR #2134](https://github.com/ponylang/ponyc/pull/2134))
- Add regex match iterator ([PR #2109](https://github.com/ponylang/ponyc/pull/2109))
- Add more promise methods (RFC 35) ([PR #2084](https://github.com/ponylang/ponyc/pull/2084))
- Add ability to default enable PIC when compiling ponyc ([PR #2113](https://github.com/ponylang/ponyc/pull/2113))

### Changed

- Treat `as` type of array literals as the alias of the element type. ([PR #2126](https://github.com/ponylang/ponyc/pull/2126))
- docgen: ignore test types and add cli flag to only document public types ([PR #2112](https://github.com/ponylang/ponyc/pull/2112))

## [0.16.1] - 2017-07-30

### Fixed

- Fix reachability analysis for intersection types ([PR #2106](https://github.com/ponylang/ponyc/pull/2106))
- Fix compiler assertion failure at code generation ([PR #2099](https://github.com/ponylang/ponyc/pull/2099))
- FreeBSD builds([PR #2107](https://github.com/ponylang/ponyc/pull/2107))

## [0.16.0] - 2017-07-28

### Fixed

- Fix compiler assertion failure on unused reference to `_` ([PR #2091](https://github.com/ponylang/ponyc/pull/2091))
- Destroy all actors on runtime termination ([PR #2058](https://github.com/ponylang/ponyc/pull/2058))
- Fixed compiler segfault on empty triple quote comment. ([PR #2053](https://github.com/ponylang/ponyc/pull/2053))
- Fix compiler crash on exhaustive match where last case is a union subset ([PR #2049](https://github.com/ponylang/ponyc/pull/2049))
- Make pony_os_std_print() write a newline when given empty input. ([PR #2050](https://github.com/ponylang/ponyc/pull/2050))
- Fix boxed tuple identity when type identifiers differ ([PR #2009](https://github.com/ponylang/ponyc/pull/2009))
- Fix crash on interface function pointer generation ([PR #2025](https://github.com/ponylang/ponyc/pull/2025))

### Added

- Alpine Linux compatibility for pony ([PR #1844](https://github.com/ponylang/ponyc/pull/1844))
- Add cli package implementing the CLI syntax ([PR #1897](https://github.com/ponylang/ponyc/pull/1897))
- Update cli package with string-seq types, command fullname, and leaf command checking ([PR #2019](https://github.com/ponylang/ponyc/pull/2019))

### Changed

- Forbid returning and passing tuples to FFI functions ([PR #2012](https://github.com/ponylang/ponyc/pull/2012))
- Deprecate support of Clang 3.3
- Explicit partial calls - a question mark is now required to be at the call site for every call to a partial function ([RFC #39](https://github.com/ponylang/rfcs/blob/main/text/0039-explicit-partial-calls.md))

## [0.15.0] - 2017-07-08

### Fixed

- Fix bug in `as` capture ([PR #1981](https://github.com/ponylang/ponyc/pull/1981))
- Fix assert failure on lambda parameter missing type. ([PR #2011](https://github.com/ponylang/ponyc/pull/2011))
- Fix iftype where the type variable appears as a type parameter. ([PR #2007](https://github.com/ponylang/ponyc/pull/2007))
- Fix support for recursive constraints in iftype conditions. ([PR #1961](https://github.com/ponylang/ponyc/pull/1961))
- Fix segfault in Array.trim_in_place ([PR #1999](https://github.com/ponylang/ponyc/pull/1999))
- Fix segfault in String.trim_in_place ([PR #1997](https://github.com/ponylang/ponyc/pull/1997))
- Assertion failure with directly recursive trait ([PR #1989](https://github.com/ponylang/ponyc/pull/1989))
- Add compile error for generic Main ([PR #1970](https://github.com/ponylang/ponyc/pull/1970))
- Prevent duplicate long_tests from being registered ([PR #1962](https://github.com/ponylang/ponyc/pull/1962))
- Assertion failure on identity comparison of tuples with different cardinalities ([PR #1946](https://github.com/ponylang/ponyc/pull/1946))
- Stop default arguments from using the function scope ([PR #1948](https://github.com/ponylang/ponyc/pull/1948))
- Fix compiler crash when a field is used in a default argument. ([PR #1940](https://github.com/ponylang/ponyc/pull/1940))
- Fix compiler crash on non-existent field reference in constructor. ([PR #1941](https://github.com/ponylang/ponyc/pull/1941))
- Fix compiler crash on "_" as argument in a case expression. ([PR #1924](https://github.com/ponylang/ponyc/pull/1924))
- Fix compiler crash on type argument error inside an early return. ([PR #1923](https://github.com/ponylang/ponyc/pull/1923))
- Correctly generate debug information in forwarding methods ([PR #1914](https://github.com/ponylang/ponyc/pull/1914))
- Resolved compiler segfault on optimization pass (issue #1225) ([PR #1910](https://github.com/ponylang/ponyc/pull/1910))
- Fix a bug in finaliser handling ([PR #1908](https://github.com/ponylang/ponyc/pull/1908))
- Fix compiler crash for type errors in call arguments inside a tuple. ([PR #1906](https://github.com/ponylang/ponyc/pull/1906))
- Fix compiler crash involving "dont care" symbol in an if or try block. ([PR #1907](https://github.com/ponylang/ponyc/pull/1907))
- Don't call TCPConnection backpressure notifies incorrectly ([PR #1904](https://github.com/ponylang/ponyc/pull/1904))
- Fix outdated methods in persistent.Map docstring. ([PR #1901](https://github.com/ponylang/ponyc/pull/1901))
- Fix format for number types (issue #1920) ([PR #1927](https://github.com/ponylang/ponyc/pull/1927))

### Added

- Make tuples be subtypes of empty interfaces (like Any). ([PR #1937](https://github.com/ponylang/ponyc/pull/1937))
- Add Persistent Vec (RFC 42) ([PR #1949](https://github.com/ponylang/ponyc/pull/1949))
- Add support for custom serialisation (RFC 21) ([PR #1839](https://github.com/ponylang/ponyc/pull/1839))
- Add persistent set (RFC 42) ([PR #1925](https://github.com/ponylang/ponyc/pull/1925))
- Bare methods and bare lambdas (RFC 34) ([PR #1858](https://github.com/ponylang/ponyc/pull/1858))
- xoroshiro128+ implementation ([PR #1909](https://github.com/ponylang/ponyc/pull/1909))
- Exhaustive match ([RFC #40](https://github.com/ponylang/rfcs/blob/main/text/0040-exhaustive-match.md)) ([PR #1891](https://github.com/ponylang/ponyc/pull/1891))
- Command line options for printing help ([PR #1899](https://github.com/ponylang/ponyc/pull/1899))
- `Nanos.from_wall_clock` function to convert from a wall clock as obtained from `Time.now()` into number of nanoseconds since "the beginning of time". ([PR #1967](https://github.com/ponylang/ponyc/pull/1967))

### Changed

- Change machine word constructors to have no default argument. ([PR #1938](https://github.com/ponylang/ponyc/pull/1938))
- Change iftype to use elseif instead of elseiftype as next keyword. ([PR #1905](https://github.com/ponylang/ponyc/pull/1905))
- Removed misleading `Time.wall_to_nanos`. ([PR #1967](https://github.com/ponylang/ponyc/pull/1967))

## [0.14.0] - 2017-05-06

### Fixed

- Compiler error instead of crash for invalid this-dot reference in a trait. ([PR #1879](https://github.com/ponylang/ponyc/pull/1879))
- Compiler error instead of crash for too few args to constructor in case pattern. ([PR #1880](https://github.com/ponylang/ponyc/pull/1880))
- Pony runtime hashmap bug that resulted in issues [#1483](https://github.com/ponylang/ponyc/issues/1483), [#1781](https://github.com/ponylang/ponyc/issues/1781), and [#1872](https://github.com/ponylang/ponyc/issues/1872). ([PR #1886](https://github.com/ponylang/ponyc/pull/1886))
- Compiler crash when compiling to a library ([Issue #1881](https://github.com/ponylang/ponyc/issues/1881))([PR #1890](https://github.com/ponylang/ponyc/pull/1890))

### Changed

- TCPConnection.connect_failed, UDPNotify.not_listening, TCPListenNotify.not_listening no longer have default implementation. The programmer is now required to implement error handling or consciously choose to ignore. ([PR #1853](https://github.com/ponylang/ponyc/pull/1853)

## [0.13.2] - 2017-04-29

### Fixed

- Don’t consider type arguments inside a constraint as constraints. ([PR #1870](https://github.com/ponylang/ponyc/pull/1870))
- Disable mcx16 on aarch64 ([PR #1856](https://github.com/ponylang/ponyc/pull/1856))
- Fix assert failure on explicit reference to `this` in constructor. (issue #1865) ([PR #1867](https://github.com/ponylang/ponyc/pull/1867))
- Compiler crash when using unconstrained type parameters in an `iftype` condition (issue #1689)

## [0.13.1] - 2017-04-22

### Fixed

- Reify function references used as addressof operands correctly ([PR #1857](https://github.com/ponylang/ponyc/pull/1857))
- Properly account for foreign objects in GC ([PR #1842](https://github.com/ponylang/ponyc/pull/1842))
- Compiler crash when using the `addressof` operator on a function with an incorrect number of type arguments

### Added

- Iftype conditions (RFC 26) ([PR #1855](https://github.com/ponylang/ponyc/pull/1855))

## [0.13.0] - 2017-04-07

### Fixed

- Do not allow capability subtyping when checking constraint subtyping. ([PR #1816](https://github.com/ponylang/ponyc/pull/1816))
- Allow persistent map to use any hash function ([PR #1799](https://github.com/ponylang/ponyc/pull/1799))

### Changed

- Pass # of times called to TCPConnectionNotify.received ([PR #1777](https://github.com/ponylang/ponyc/pull/1777))

## [0.12.3] - 2017-04-01

### Fixed

- Improve Visual Studio and Microsoft C++ Build Tools detection. ([PR #1794](https://github.com/ponylang/ponyc/pull/1794))

## [0.12.2] - 2017-03-30

### Fixed

- Fix extreme CPU use in scheduler on Windows ([PR #1785](https://github.com/ponylang/ponyc/pull/1785))
- Fix broken ponytest "only" filter ([PR #1780](https://github.com/ponylang/ponyc/pull/1780))

## [0.12.1] - 2017-03-29

### Fixed

- Bug in ponytest resulted in all tests being skipped ([PR #1778](https://github.com/ponylang/ponyc/pull/1778))

## [0.12.0] - 2017-03-29

### Fixed

- Don't ignore buffer length when printing ([PR #1768](https://github.com/ponylang/ponyc/pull/1768))
- Ifdef out ANSITerm signal handler for SIGWINCH ([PR #1763](https://github.com/ponylang/ponyc/pull/1763))
- Fix build error on 32 bits systems ([PR #1762](https://github.com/ponylang/ponyc/pull/1762))
- Fix annotation-related compiler assertion failure (issue #1751) ([PR #1757](https://github.com/ponylang/ponyc/pull/1757))
- Improve packaged Linux binary performance ([PR #1755](https://github.com/ponylang/ponyc/pull/1755))
- Fix false positive test failure on 32 bits ([PR #1749](https://github.com/ponylang/ponyc/pull/1749))

### Added

- Support XCode 8.3 and LLVM 3.9 ([PR #1765](https://github.com/ponylang/ponyc/pull/1765))

### Changed

- Arrays as sequences ([PR #1741](https://github.com/ponylang/ponyc/pull/1741))
- Add ability for ponytest to exclude tests based on name ([PR #1717](https://github.com/ponylang/ponyc/pull/1717))
- Renamed ponytest "filter" flag to "only" ([PR #1717](https://github.com/ponylang/ponyc/pull/1717))

## [0.11.4] - 2017-03-23

### Fixed

- Identity comparison of boxed values ([PR #1726](https://github.com/ponylang/ponyc/pull/1726))
- Reify type refs in inherited method bodies ([PR #1722](https://github.com/ponylang/ponyc/pull/1722))
- Fix compilation error on non-x86 systems ([PR #1718](https://github.com/ponylang/ponyc/pull/1718))
- Call finalisers for embedded fields when parent type has no finalizer. ([PR #1629](https://github.com/ponylang/ponyc/pull/1629))
- Fix compiling errors for 32-bit ([PR #1709](https://github.com/ponylang/ponyc/pull/1709))
- Improved persistent map api (RFC 36) ([PR #1705](https://github.com/ponylang/ponyc/pull/1705))
- Fix compiler assert on arrow to typeparam in constraint. ([PR #1701](https://github.com/ponylang/ponyc/pull/1701))
- Segmentation fault on runtime termination.

## [0.11.3] - 2017-03-16

### Fixed

- Build Linux release binaries correctly ([PR #1699](https://github.com/ponylang/ponyc/pull/1699))

## [0.11.2] - 2017-03-16

### Fixed

- Fix illegal instruction errors on older cpus when using packaged Pony ([PR #1686](https://github.com/ponylang/ponyc/pull/1686))
- Correctly pass `arch=` when building docker image ([PR #1681](https://github.com/ponylang/ponyc/pull/1681))

### Changed

- Make buffered.Reader.append accept any ByteSeq. ([PR #1644](https://github.com/ponylang/ponyc/pull/1644))

## [0.11.1] - 2017-03-14

### Fixed

- Fix AVX/AVX2 issues with prebuilt ponyc ([PR #1663](https://github.com/ponylang/ponyc/pull/1663))
- Fix linking with '--as-needed' (sensitive to linking order) ([PR #1654](https://github.com/ponylang/ponyc/pull/1654))
- Fix FreeBSD 11 compilation

## [0.11.0] - 2017-03-11

### Fixed

- Make HTTPSession type tag by default ([PR #1650](https://github.com/ponylang/ponyc/pull/1650))
- Fix type parameters not being visible to a lambda type in a type alias ([PR #1633](https://github.com/ponylang/ponyc/pull/1633))
- Remove the check for union types on match error ([PR #1630](https://github.com/ponylang/ponyc/pull/1630))
- TCPListener: unsubscribe asio before socket close ([PR #1626](https://github.com/ponylang/ponyc/pull/1626))
- Fix buffer overflow in case method docstring ([PR #1615](https://github.com/ponylang/ponyc/pull/1615))
- Fix capability checking for gencap-constrained type parameters. ([PR #1593](https://github.com/ponylang/ponyc/pull/1593))
- Fix error in ANTLR grammar regarding duplicate '-~'. (#1602) ([PR #1604](https://github.com/ponylang/ponyc/pull/1604))
- Escape special characters in ANLTR strings. (#1600) ([PR #1601](https://github.com/ponylang/ponyc/pull/1601))
- Use LLVM to detect CPU features by default if --features aren't specified. ([PR #1580](https://github.com/ponylang/ponyc/pull/1580))
- Always call finalisers for embedded fields ([PR #1586](https://github.com/ponylang/ponyc/pull/1586))
- Check for null terminator in String._append ([PR #1582](https://github.com/ponylang/ponyc/pull/1582))
- Fix TCP Connection data receive race condition ([PR #1578](https://github.com/ponylang/ponyc/pull/1578))
- Fix Linux epoll event resubscribe performance and race condition. ([PR #1564](https://github.com/ponylang/ponyc/pull/1564))
- Correctly resubscribe TCPConnection to ASIO events after throttling ([PR #1558](https://github.com/ponylang/ponyc/pull/1558))
- Performance fix in the runtime actor schedule ([PR #1521](https://github.com/ponylang/ponyc/pull/1521))
- Disallow type parameter names shadowing other types. ([PR #1526](https://github.com/ponylang/ponyc/pull/1526))
- Don't double resubscribe to asio events in TCPConnection ([PR #1509](https://github.com/ponylang/ponyc/pull/1509))
- Improve Map.get_or_else performance ([PR #1482](https://github.com/ponylang/ponyc/pull/1482))
- Back pressure notifications now given when encountered while sending data during `TCPConnection` pending writes
- Improve efficiency of muted TCPConnection on non Windows platforms ([PR #1477](https://github.com/ponylang/ponyc/pull/1477))
- Compiler assertion failure during type checking
- Runtime memory allocator bug
- Compiler crash on tuple sending generation (issue #1546)
- Compiler crash due to incorrect subtype assignment (issue #1474)
- Incorrect code generation when sending certain types of messages (issue #1594)

### Added

- Close over free variables in lambdas and object literals ([PR #1648](https://github.com/ponylang/ponyc/pull/1648))
- Add assert_no_error test condition to PonyTest ([PR #1605](https://github.com/ponylang/ponyc/pull/1605))
- Expose `st_dev` and `st_ino` fields of stat structure ([PR #1589](https://github.com/ponylang/ponyc/pull/1589))
- Packed structures (RFC 32) ([PR #1536](https://github.com/ponylang/ponyc/pull/1536))
- Add `insert_if_absent` method to Map ([PR #1519](https://github.com/ponylang/ponyc/pull/1519))
- Branch prediction annotations (RFC 30) ([PR #1528](https://github.com/ponylang/ponyc/pull/1528))
- Readline interpret C-d on empty line as EOF ([PR #1504](https://github.com/ponylang/ponyc/pull/1504))
- AST annotations (RFC 27) ([PR #1485](https://github.com/ponylang/ponyc/pull/1485))
- Unsafe mathematic and logic operations. Can be faster but can have undefined results for some inputs (issue #993)
- Equality comparison for NetAddress ([PR #1569](https://github.com/ponylang/ponyc/pull/1569))
- Host address comparison for NetAddress ([PR #1569](https://github.com/ponylang/ponyc/pull/1569))

### Changed

- Rename IPAddress to NetAddress ([PR #1559](https://github.com/ponylang/ponyc/pull/1559))
- Remove delegates (RFC 31) ([PR #1534](https://github.com/ponylang/ponyc/pull/1534))
- Upgrade to LLVM 3.9.1 ([PR #1498](https://github.com/ponylang/ponyc/pull/1498))
- Deprecate LLVM 3.6.2 support ([PR #1511](https://github.com/ponylang/ponyc/pull/1511))
- Deprecate LLVM 3.6.2 support ([PR #1502](https://github.com/ponylang/ponyc/pull/1502))
- Deprecate LLVM 3.6.2 support ([PR #1512](https://github.com/ponylang/ponyc/pull/1512))
- Ensure TCPConnection is established before writing data to it (issue #1310)
- Always allow writing to `_` (dontcare) ([PR #1499](https://github.com/ponylang/ponyc/pull/1499))
- Methods returning their receiver to allow call chaining have been changed to return either None or some useful value
- TCP sockets on Linux now use Epoll One Shot
- Non-sendable locals and parameters are now seen as `tag` inside of recover expressions instead of being inaccessible.
- TCP sockets on FreeBSD and MacOSX now use Kqueue one shot
- All arithmetic and logic operations are now fully defined for every input by default (issue #993)
- Removed compiler flag `--ieee-math`
- The `pony_start` runtime function now takes a `language_features` boolean parameter indicating whether the Pony-specific runtime features (e.g. network or serialisation) should be initialised

## [0.10.0] - 2016-12-12

### Fixed

- Don't violate reference capabilities when assigning via a field ([PR #1471](https://github.com/ponylang/ponyc/pull/1471))
- Check errors correctly for method chaining ([PR #1463](https://github.com/ponylang/ponyc/pull/1463))
- Fix compiler handling of type params in stacks (issue #918) ([PR #1452](https://github.com/ponylang/ponyc/pull/1452))
- Fix String.recalc method for cases where no null terminator is found (issue #1446) ([PR #1450](https://github.com/ponylang/ponyc/pull/1450))
- Make space() check if string is null terminated (issue #1426) ([PR #1430](https://github.com/ponylang/ponyc/pull/1430))
- Fix is_null_terminated reading arbitrary memory (issue #1425) ([PR #1429](https://github.com/ponylang/ponyc/pull/1429))
- Set null terminator in String.from_iso_array (issue #1435) ([PR #1436](https://github.com/ponylang/ponyc/pull/1436))

### Added

- Added String.split_by, which uses a string delimiter (issue #1399) ([PR #1434](https://github.com/ponylang/ponyc/pull/1434))
- Extra DTrace/SystemTap probes concerning scheduling.

### Changed

- Behaviour calls return None instead of their receiver (RFC 28) ([PR #1460](https://github.com/ponylang/ponyc/pull/1460))
- Update from_array to prevent a copy (issue #1097) ([PR #1423](https://github.com/ponylang/ponyc/pull/1423))

## [0.9.0] - 2016-11-11

### Fixed

- Stop leaking memory during serialization (issue #1413) ([PR #1414](https://github.com/ponylang/ponyc/pull/1414))
- Fixed compiler segmentation fault when given an invalid target triple. ([PR #1406](https://github.com/ponylang/ponyc/pull/1406))
- Fixed error message when no type arguments are given (issue #1396) ([PR #1397](https://github.com/ponylang/ponyc/pull/1397))
- Fixed compiler assert failure when constructor is called on type intersection (issue #1398) ([PR #1401](https://github.com/ponylang/ponyc/pull/1401))
- Fix compiler assert fail on circular type inference error (issue #1334) ([PR #1339](https://github.com/ponylang/ponyc/pull/1339))
- Performance problem in the scheduler queue when running with many threads (issue #1404)
- Invalid name mangling in generated C headers (issue #1377)

### Added

- Method chaining (RFC #25) ([PR #1411](https://github.com/ponylang/ponyc/pull/1411))
- Iter class methods `all`, `any`, `collect`, `count`, `find`, `last`, `nth`, `run`, `skip`, `skip_while`, `take`, `take_while` (issue #1370)
- Output of `ponyc --version` shows C compiler used to build pony (issue #1245)
- Makefile detects `llvmconfig39` in addition to `llvm-config-3.9` (#1379)
- LLVM 3.9 support

### Changed

- Changed lambda literal syntax to be more concise (issue #1391) ([PR #1400](https://github.com/ponylang/ponyc/pull/1400))

## [0.8.0] - 2016-10-27

### Fixed

- Link the correct version of `libponyrt` when compiling with `--pic` on Linux (issue #1359)

### Added

- Runtime function `pony_send_next`. This function can help optimise some message sending scenarios.
- Floating point `min_normalised`. The function returns the smallest normalised positive number, as `min_value` used to do (issue #1351)

### Changed

- Floating point `min_value` now returns the smallest negative number instead of the smallest normalised positive number (issue #1351)

## [0.7.0] - 2016-10-22

### Fixed

- Concatenate docstrings from case methods (issue #575).

### Added

- TCP read and write backpressure hooks in `TCPConnection` (issue #1311)
- Allow TCP notifiers to cause connections to yield while receiving (issue #1343)

### Changed

- `break` without a value now generates its value from the `else` branch of a loop instead of being an implicit `break None`.
- The `for` loop will now break out of the loop instead of continuing with the following iterations if `Iterator.next` errors.

## [0.6.0] - 2016-10-20

### Fixed

- Compiling ponyrt with Clang versions >= 3.3, < 3.6.
- Restrict mutable tuple recovery to maintain reference capability security (issue #1123)
- Crash in the runtime scheduler queues

### Added

- DTrace and SystemTap support - `use=dtrace`

### Changed

- Replaces `use=telemetry` by DTrace/SystemTap scripts
- `String.cstring()` now always returns a null-terminated string
  (which may result in a copy) while `cpointer()` (also available on
  `Array` objects) returns a pointer to the underlying array as-is
  (issue #1309).

## [0.5.1] - 2016-10-15

### Fixed

- `SSLConnection` ignoring the `sent` notifier method (issue #1268)
- Runtime crash in the runtime scheduler queues (issue #1319)

## [0.5.0] - 2016-10-09

### Fixed

- Memory copy bounds for `String.clone` (issue #1289).
- Security issues in `ProcessMonitor` (issue #1180)
- `SSLConnection` bugs due to missing `sentv` notify method (issue #1282)

### Added

- `Iter` class (issue #1267)
- read_until method on buffered.Reader (RFC 0013)
- `format` package (issue #1285)

### Changed

- `Stringable` interface no longer involves formatting (issue #1285)
- Remove unused error types from ProcessError (issue #1293)
- HTML documentation for expanded union types now adds line breaks to improve readability (issue #1263)

## [0.4.0] - 2016-09-26

### Fixed

- Unexpected message ordering in `ProcessManager` (issue #1265)

### Added

- TCP writev performance improvement by avoiding throwing errors

## [0.3.3] - 2016-09-23

### Fixed

- Incorrect build number generated on Windows when building from non-git directory.
- Stop generating `llvm.invariant.load` for fields of `val` references.
- Embedded fields construction through tuples.

### Added

- Improved error handling for `files` package.
- ProcessMonitor.expect
- ProcessNotify.created
- ProcessNotify.expect

### Changed

- On Linux and FreeBSD, ponyc now uses $CC as the linker if the environment variable is defined.

## [0.3.2] - 2016-09-18

### Fixed

- The `ponyc` version is now consistently set from the VERSION file.
- Stop generating `llvm.invariant.load` intrinsic for "let" references, as these don't necessarily match the semantics of that intrinsic.

### Changed

- The `setversion` and `release` commands have been removed from `Makefile`.
- LTO is again enabled by default on OSX
- make now builds a `release` rather than `debug` build by default

## [0.3.1] - 2016-09-14

### Fixed

- Make sure all scheduler threads are pinned to CPU cores; on Linux/FreeBSD this wasn't the case for the main thread.
- Account for both hyperthreading and NUMA locality when assigning scheduler threads to cores on Linux.
- Stop generating `llvm.invariant.start` intrinsic. It was causing various problems in code generation.
- Buffer overflow triggerable by very long `ponyc` filename (issue #1177).
- Assertion failure in optimisation passes.
- Race condition in scheduler queues on weakly-ordered architectures.
- Issue #1212 by reverting commit e56075d46d7d9e1d8c5e8be7ed0506ad2de98734

### Added

- `--ponypinasio` runtime option for pinning asio thread to a cpu core.
- `--ponynopin` runtime option for not pinning any threads at all.

### Changed

- Path.base now provides option to omit the file extension from the result.
- Map.upsert returns value for upserted key rather than `this`.
- `ponyc --version` now includes llvm version in its output.
- LTO is now disabled by default on OSX.

## [0.3.0] - 2016-08-26

### Fixed

- Check for Main.create before reachability analysis.
- Interface subtyping need not be invariant on type args.
- @fowles: handle regex empty match.
- @praetonus: readline history handling.
- Put unbox constructors on machine words into the vtable.
- @jonas-l: parse URL with omitted password.
- Adjust for ephemerality in cap_single().
- Finalisation always occurs.
- Type checking platform dependent FFI declarations on all platforms.
- Interface subtyping takes receiver capabilities into account.
- Pony-as-library support, particularly pony_register_thread().
- Bug in `HashMap._search`.
- Crashing gc bug caused by "force freeing" objects with finalizers.
- Bug in `String.compare` and `String.compare_sub`.
- Crashing gc bug from using `get` instead of `getorput` in `gc_markactor`.
- Add -rpath to the link command for library paths
- Simplify contains() method on HashMap.
- Lambda captures use the alias of the expression type.
- Trace boxed primitives in union types.
- Use -isystem for LLVM include directory only if it is not in search path.
- Union tuples as return type with machine words (issue #849)
- Incorrect \" handling in character literals
- Incorrect \' handling in string literals
- Compiler crash on type alias of a lambda type.
- Late detection of errors silently emitted in lexer/parser.
- Compiler crash when handling invalid lambda return types
- Memory leak fixed when something sent as iso is then sent as val.
- Compiler crash when handling object literal with uninitialized fields.
- Associate a nice name with function types based on the type of the function.
- Use the nice name for types when generating documentation.
- Compiler crash when generating C library for the exported actors containing functions with variadic return type contatining None
- AST Printing of string literals with quote characters.
- HTTP/1.1 connections are now persistent by default.
- Runtime crash when Main.create is a function instead of a constructor.
- Compiler bug where `as` operator with a lambda literal caused seg fault.
- String.read_int failure on lowest number in the range of signed integers.
- Regex incorrect of len variable when PCRE2_ERROR_NOMEMORY is encountered.
- No longer silently ignores lib paths containing parens on Windows.
- Make linking more dynamic and allow for overriding linker and linker arch.
- Fix issue with creating hex and octal strings if precision was specified.
- Correctly parses Windows 10 SDK versions, and includes new UCRT library when linking with Windows 10 SDK.
- Performance of Array.append and Array.concat (no unnecessary calls to push).
- Performance of Map.upsert and Map.update (don't replace existing keys)
- Segmentation fault from allocating zero-sized struct.
- Segmentation fault from serialising zero-sized array.
- Assertion failure from type-checking in invalid programs.
- Make the offset parameter of String.rfind inclusive of the given index.

### Added

- 32-bit ARM port.
- 32-bit X86 port.
- Embedded fields.
- C-style structs.
- Maybe[A] to encode C-style structs that aren't present.
- OpenFile and CreateFile primitives to return well-typed errors.
- @fowles: String.join
- Array slice, permute, reverse.
- Pooltrack and telemetry runtime builds.
- ifdef expressions for platform dependent code.
- User specified build flags.
- Pure Pony implementation of 128 bit integer maths for 32-bit platforms.
- UDP broadcast for both IPv4 and IPv6.
- Message batching.
- Case functions.
- Timeouts for PonyTest long tests.
- contains() method on HashMap
- contains() method on HashSet
- Support for empty sections in ini parsing.
- --verbose,-V option for compiler informational messages.
- Logger package
- `ArrayValues.rewind()` method.
- Nanos primitive in time package.
- Persistent package, with List and Map
- Custom chunk size for Stdin.
- Itertools package
- TCPConnection.expect
- TCPConnectionNotify.sentv
- HashMap.get_or_else
- ponytest TestHelper.expect_action, complete_action, and fail_action
- ponytest TestHelper.dispose_when_done
- copysign and infinite for floating point numbers
- contains() method on Array
- GC tracing with acquire/release semantics.
- pony_alloc_msg_size runtime function
- `net/WriteBuffer`
- `serialise` package.
- optional parameter in json objects, arrays, and doc to turn on pretty printing
- `DoNotOptimise` primitive
- `compact` method for `Array` and `String`
- `String.push_utf32()` method.
- Allow the use of a LLVM bitcode file for the runtime instead of a static library.
- add iterators to persistent/Map (`keys()`, `values()`, and `pairs()`)
- add notification of terminal resize
- `trim` and `trim_in_place` methods for `Array` and `String`.
- `is_null_terminated` and `null_terminated` methods for `String`.
- `from_iso_array` constructor on `String`.
- `Sort` primitive
- PonyBench package

### Changed

- Interfaces are invariant if they are structurally equivalent.
- Improved type checking with configuration management.
- Improved realloc behaviour after heap_alloc_large.
- Set-based upper bounds for generic constraints.
- Moved the position of a default capability in a type specification.
- Replaced '&' with 'addressof' for taking address in FFI calls.
- @jemc: use half-open ranges for String operations.
- Improved TCPConnection with a dynamically size of buffers
- Drop dynamic LTO detection in the build system.
- Parameterized Array.find and Array.rfind with a comparator.
- `this->` adapted types check match on the upper bounds.
- Renamed `identityof` to `digestof`.
- Moved and renamed `net/Buffer` to `buffered/Reader` and `buffered/Writer`.
- Print compiler error and info messages to stderr instead of stdout.
- `Hashmap.concat` now returns `this` rather than `None`
- Only allow single, internal underscores in numeric literals.
- `ponyc --version` now includes the build type (debug/release) in its output.
- Strings now grow and shrink geometrically.
- Embedded fields can now be constructed from complex expressions containing constructors
- Sendable members of non-sendable objects can be used in recover expressions in certain cases.
- ProcessNotify functions are passed a reference to ProcessMonitor.
- The constructor of `Options` doesn't require an `Env` anymore but just a simple `String` array.

## [0.2.1] - 2015-10-06

### Fixed

- Check shallow marking in heap_ismarked.

## [0.2.0] - 2015-10-05

### Fixed

- Handle internal pointers and recursion.
- Allow recursing through non-pony alloc'd memory in GC.
- Set an LLVM triple with no version stamp to prevent XCode 7 link warnings.
- use "path:" adds link paths only for the current build.
- Handle null characters in Strings and string literals.

### Added

- Platform indicators for LP64, LLP64, ILP32.
- Compile and link with LTO.
- Use Pointer[None] for void* in FFI.
- Root authority capability in Env.
- Fine grained capabilities for files and directories.
- Use Capsicum on FreeBSD.
- Apply can be sugared with type arguments.
- Search pony_packages directories for use commands.
- Buffer peek functions (@jemc)
- collections/Ring
- Promises package

### Changed

- Renamed some builtin types.
- abs() now returns an unsigned integer.
- Improved memory allocation speed.
- Reduced memory pressure.
- Scheduler steals when only the CD is on a scheduler thread queue.
- use commands searches ../pony_packages recursively similar to Node.js
- Readline uses a Promise to handle async responses.

## [0.1.7] - 2015-06-18

### Fixed

- Viewpoint adaptation with a type expression on the left-hand side.

### Added

- Pass Pony function pointers to C FFI.

### Changed

- The pony runtime now uses the same option parser as ponyc. A pony program exits if bad runtime args are provided.
- Output directory now created if it doesn't already exist.
- Improvements to automatic documentation generator.
- Union type for String.compare result.

## [0.1.6] - 2015-06-15

### Fixed

- ANSI stripping on zero length writes to stdout/stderr.
- More OS X 10.8 compatibility.
- SSL multithreading support.
- Nested tuple code generation.
- Only finalise blocked actors when detecting quiescence.
- URL parse error.

### Added

- Automatic documentation generator in the compiler.
- FreeBSD 10.1 support, thanks to Ben Laurie.
- Allow method calls on union types when the signatures are compatible.
- Subtyping of polymorphic methods.
- Primitive `_init` and `_final` for C library initialisation and shutdown.
- collections.Flags
- lambda sugar.

### Changed

- Separated the FFI '&' operator from the identityof operator.
- Operators on Set and Map are now persistent.
- use "file:..." becomes use "package:..."
- Allow "s at the end of triple-quoted strings.
- Allow behaviours and functions to be subtypes of each other.

## [0.1.5] - 2015-05-15

### Fixed

- OS X 10.8 compatibility.

## [0.1.4] - 2015-05-14

### Fixed

- Check whether parameters to behaviours, actor constructors and isolated constructors are sendable after flattening, to allow sendable type parameters to be used as parameters.
- Eliminate spurious "control expression" errors when another compile error has occurred.
- Handle circular package dependencies.
- Fixed ponyc options issue related to named long options with no arguments
- Cycle detector view_t structures are now reference counted.

### Added

- ANSI terminal handling on all platforms, including Windows.
- The lexer now allows underscore characters in numeric literals. This allows long numeric literals to be broken up for human readability.
- "Did you mean?" support when the compiler doesn't recognise a name but something similar is in scope.
- Garbage collection and cycle detection parameters can now be set from the command line.
- Added a FileStream wrapper to the file package.

### Changed

- When using a package without a package identifier (eg. `use "foo"` as opposed to `use f = "foo"`), a `Main` type in the package will not be imported. This allows all packages to include unit tests that are run from their included `Main` actor without causing name conflicts.
- The `for` sugar now wraps the `next()` call in a try expression that does a `continue` if an error is raised.