0.30.0

Language changes

• (breaking-change) Enforce abstract methods return types. (#7956, #7999, #8010, thanks @asterite)
• (breaking-change) Don't allow ranges to span across lines. (#7888, thanks @oprypin)

Macros

• Add args/named_args macro methods to Annotations. (#7694, thanks @Blacksmoke16)
• Unify resolve and types macro methods API for Type and Path for convenience. (#7970, thanks @asterite)

Standard library

• (breaking-change) Remove UUID#to_slice in favor of UUID#bytes to fix dangling pointer issues. (#7901, thanks @ysbaddaden)
• (performance) Improve Box of reference types. (#8016, thanks @waj)
• Fixed initial seed of Random::ISAAC. (#7977, thanks @asterite)
• Fixed mem intrinsics for aarch64. (#7983, thanks @drujensen)
• Add Benchmark.memory. (#7835, thanks @r00ster91)
• Allow setting default capacity for StringPool. (#7899, thanks @carlhoerberg)
• Add type restrictions to INI. (#7831, thanks @j8r)
• Fixed Logger docs. (#7898, thanks @dprobinson)
• Fix example codes in multiple places. (#8003, thanks @maiha)

Numeric

• Fixed incorrect Int#% overflow. (#7980, thanks @asterite)
• Fixed inconsistency between Float#to_s and BigFloat#to_s, always show .0 for whole numbers. (#7982, thanks @Lasvad)

Text

• Fixed unicode alternate ranges generation. (#7924, thanks @asterite)

Collections

• Add Enumerable#tally. (#7921, thanks @kachick)
• Add Enumerable#reduce? overload with not initial value. (#7941, thanks @miketheman)
• Fix specs of Enumerable#min_by?. (#7919, thanks @kachick)

Serialization

• (breaking-change) JSON: use enums instead of symbols. (#7966, thanks @asterite)
• Fixed YAML deserialization of String in a union type. (#7938, thanks @asterite)
• Validate element names in XML::Builder. (#7965, thanks @Blacksmoke16)
• Allow numeric keys in JSON (ie: Hash(Int32, String).from_json). (#7944, thanks @asterite)
• Add alias/merge methods to YAML::Builder and YAML::Nodes::Builder. (#7949, thanks @Blacksmoke16)

Files

• Adds File.readlink to match File.symlink. (#7858, thanks @didactic-drunk)

Networking

• (breaking-change) Improve URL encoding. URI.escape and URI.unescape are renamed to URI.encode_www_form and URI.decode_www_form. Add URI.encode and URI.decode. (#7997, #8021, thanks @straight-shoota, @bcardiff)
• (performance) HTTP protocol parsing optimizations. (#8002, #8009, thanks @asterite)
• Fixed HTTP::Server response double-close. (#7908, thanks @asterite)
• Enforce HTTP::Client host argument is just a host. (#7958, thanks @asterite)
• Allow HTTP::Params.encode to encode an arrays of values for a key. (#7862, thanks @rodrigopinto)
• Forward read_timeout/write_timeout in ssl socket to underlaying socket. (#7820, thanks @carlhoerberg)
• Natively support Same-site Cookies. (#7864, thanks @Blacksmoke16)
• Allow setting buffer size for IO::Buffered. (#7930, thanks @carlhoerberg)

Crypto

• Require openssl algorithm in pkcs5. (#7985, thanks @will)
• Fixed cipher expectation in OpenSSL::SSL::Socket spec. (#7871, thanks @j8r)

Concurrency

• Fixed sysconf call on OpenBSD. (#7879, thanks @jcs)

System

• Introduce System::User and System::Group. (#7725, thanks @woodruffw, @chris-huxtable)
• Add docs for Process::Status.exit_status (#7873). (#8014, thanks @UlisseMini)

Compiler

• Fixed codegen of pointer.as(Nil). (#8019, thanks @asterite)
• Fixed edge cases in parser and stringifier. (#7886, thanks @oprypin)
• Fixed concrete_types for virtual metaclass and modules. (#7951, thanks @bcardiff)
• Fixed incorrect remove_indirection in TypeDefType. (#7971, thanks @bcardiff)
• Fixed missing CRYSTAL_SPEC_COMPILER_FLAGS usage in some more specs. (774768, thanks @bcardiff)
• Revamp compile error formatting & output. (#7748, thanks @martimatix)
• Add support for LLVM 8. (#7987, thanks @bcardiff)
• Add support for LLVM 7. (#7986, thanks @bcardiff, @waj, @foutrelis, @wmoxam)
• Add debug log helper function for codegen. (#7935, #7937, thanks @bcardiff)
• Refactor codegen of unions. (#7940, thanks @bcardiff)
• Move LLVMId from CodeGenVisitor to Program. (#7973, thanks @bcardiff)
• Minor additions and refactors on for LLVM codegen. (#7972, thanks @bcardiff)
• Add bin/check-compiler-flag helper script. Add make clean_cache. (da3892, thanks @bcardiff)

Language semantics

• Fixed generic metaclass argument expansion. (#7916, thanks @asterite)
• Fixed top-level private const not being scoped. (#7907, thanks @asterite)
• Fixed enum overflow when declaring members. (#7881, thanks @asterite)
• Fixed annotation lookup on generic types. (#7891, thanks @asterite)

Tools

Formatter

• Format top-level inline macros. (#7889, #7992, thanks @asterite)

Doc generator

• Allow rendering tags on methods without any docs. (#7952, thanks @Blacksmoke16)

Others

• Update CI to use 0.29.0. (#7863, thanks @bcardiff)
• Automated snap publishing. (#7893, thanks @bcardiff)
• Use LLVM 6.0.1 for darwin official packages. (#7994, thanks @bcardiff)