What's Changed

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

New Contributors

• @arkuhn made their first contribution in https://github.com/pydantic/monty/pull/485
• @tontinton made their first contribution in https://github.com/pydantic/monty/pull/493
• @strawgate made their first contribution in https://github.com/pydantic/monty/pull/502

Full Changelog: https://github.com/pydantic/monty/compare/v0.0.18...0.0.19-beta.1