0.0.19-beta.1 - 2026-07-08

What's Changed

• introduce iterator helpers that manage recursion / time by @davidhewitt in #454
• fix interactions with global names, function scopes & repl by @davidhewitt in #469
• experiment with StringBuilder to guard strings under construction by @davidhewitt in #448
• fix type-object marshalling across the sandbox boundary by @samuelcolvin in #478
• FromArgs slots cleanup by @samuelcolvin in #484
• fix(file): release the buffered-file OS-call pin on all paths by @arkuhn in #485
• add __name__ et al. by @samuelcolvin in #495
• f-strings improvements by @samuelcolvin in #494
• fix: return error instead of panicking in ForIter heap read by @tontinton in #493
• Move execution to a subprocess pool by @samuelcolvin in #500
• Add 'Part of the Pydantic Stack' footer to README by @strawgate in #502
• fix(asyncio): raise RuntimeError on cross-gather coroutine reuse by @samuelcolvin in #503
• fix CI since subprocesses by @samuelcolvin in #505
• Async memory limits by @samuelcolvin in #504
• uprev ruff and ty crates by @samuelcolvin in #506
• move py_eq to accept &Value for RHS by @davidhewitt in #508
• use published ruff and ty crates by @samuelcolvin in #512
• reintroduce feed_start API to both python & JS by @davidhewitt in #507
• use stable clippy in ci by @samuelcolvin in #513
• Publish all library crates to crates.io by @samuelcolvin in #514
• websocket protocol by @samuelcolvin in #509
• Support multi-level (transitive) closure capture by @samuelcolvin in #516
• move recursion count from heap to VM by @davidhewitt in #511
• monty-cpython: rich sandbox tracebacks with source previews and carets by @samuelcolvin in #517
• fix various bugs with global name scoping by @davidhewitt in #510
• ci: try newer manylinux version by @davidhewitt in #519
• Add unicodedata module, refactor and improve FromArgs macros by @samuelcolvin in #522
• rename and change behaviour of external_lookup by @samuelcolvin in #520
• encode and decode codecs and error types by @samuelcolvin in #523
• Fix wasm CI by @samuelcolvin in #526
• Add resume_auto() to iteratively drive feed_start snapshots by @samuelcolvin in #527
• User-defined classes by @samuelcolvin in #515
• small perf wins by @samuelcolvin in #528
• Add benchmarks covering real agent workloads by @samuelcolvin in #530
• Bound native evaluate_function re-entry to prevent infinite recursion by @samuelcolvin in #529
• Restrict git commit and git push for claude by @samuelcolvin in #532
• Regex perf improvements by @samuelcolvin in #531
• String cheap wins (perf track 3) by @samuelcolvin in #537
• add ci stage for browser testing by @davidhewitt in #539
• prep for beta release by @samuelcolvin in #540

New Contributors

• @arkuhn made their first contribution in #485
• @tontinton made their first contribution in #493
• @strawgate made their first contribution in #502

Full Changelog: v0.0.18...0.0.19-beta.1