What's Changed

• bump to b2, fix monty-proto's self dev-dependency by @samuelcolvin in https://github.com/pydantic/monty/pull/908

v1.0.0-beta.1 - 2026-09-21

(v1.0.0-beta.1 released failed on crates.io, hence beta 2 release)

• Drop the experimental framing ahead of v1 by @rewitt94 in https://github.com/pydantic/monty/pull/811
• Percent formatting: '...' % foo and b'...' % bar by @samuelcolvin in https://github.com/pydantic/monty/pull/825
• fix flakey js test by @samuelcolvin in https://github.com/pydantic/monty/pull/826
• Implement the format() builtin by @samuelcolvin in https://github.com/pydantic/monty/pull/827
• Answer date.today() / datetime.now() in standard execution by @rewitt94 in https://github.com/pydantic/monty/pull/812
• Implement remaining math aggregation functions and fma by @samuelcolvin in https://github.com/pydantic/monty/pull/831
• fix telemetry context propagation by @davidhewitt in https://github.com/pydantic/monty/pull/830
• Support print(file=sys.stderr) by @rewitt94 in https://github.com/pydantic/monty/pull/818
• Finish binascii with the uu, quoted-printable and CRC-16 conversions by @rewitt94 in https://github.com/pydantic/monty/pull/816
• Build Python 3.14t wheels by @Kludex in https://github.com/pydantic/monty/pull/832
• make it possible to run smoke test from npm by @davidhewitt in https://github.com/pydantic/monty/pull/619
• fix browser smoke test install by @samuelcolvin in https://github.com/pydantic/monty/pull/844
• Move examples-only Python deps out of the dev group by @samuelcolvin in https://github.com/pydantic/monty/pull/849
• Match CPython for int/float arithmetic on long ints and float pow overflow by @samuelcolvin in https://github.com/pydantic/monty/pull/834
• Make the examples dependency group opt-in by @samuelcolvin in https://github.com/pydantic/monty/pull/852
• CWD support by @samuelcolvin in https://github.com/pydantic/monty/pull/828
• Add a watchdog for the CPython side of test cases and deflake lookup__mutation.py by @samuelcolvin in https://github.com/pydantic/monty/pull/854
• Accept long ints across pow(), round() and the math module by @samuelcolvin in https://github.com/pydantic/monty/pull/853
• Eager awaits by @samuelcolvin in https://github.com/pydantic/monty/pull/833
• Better casefold and other case methods compatibility by @samuelcolvin in https://github.com/pydantic/monty/pull/857
• Deps update by @samuelcolvin in https://github.com/pydantic/monty/pull/859
• Add the remaining itertools callables bar tee by @samuelcolvin in https://github.com/pydantic/monty/pull/860
• Revert itertools by @samuelcolvin in https://github.com/pydantic/monty/pull/861
• Support runtime definition of types like tuple[int, str] and dict | dict by @samuelcolvin in https://github.com/pydantic/monty/pull/858
• Implement the sys constants with a known value by @samuelcolvin in https://github.com/pydantic/monty/pull/863
• Support attribute and subscript targets in unpacking by @samuelcolvin in https://github.com/pydantic/monty/pull/865
• Add the antigravity example, running Monty in the browser by @samuelcolvin in https://github.com/pydantic/monty/pull/864
• Fix re-entrant source windows in chain, pairwise and accumulate by @rewitt94 in https://github.com/pydantic/monty/pull/843
• Missing itertools methods by @samuelcolvin in https://github.com/pydantic/monty/pull/862
• Add a regression test for the trailing-slash symlink escape by @samuelcolvin in https://github.com/pydantic/monty/pull/868
• Add the random module and an os.urandom host call by @samuelcolvin in https://github.com/pydantic/monty/pull/867
• Add the copy module by @rewitt94 in https://github.com/pydantic/monty/pull/791
• Check container growth against the memory limit before it allocates by @rewitt94 in https://github.com/pydantic/monty/pull/845
• Follow-ups for datetime by @rewitt94 in https://github.com/pydantic/monty/pull/838
• Fix two container-reentrancy panics by @rewitt94 in https://github.com/pydantic/monty/pull/846
• don't make static strings a requirement for dump stability by @davidhewitt in https://github.com/pydantic/monty/pull/810
• establish tampered snapshots as permitted: garbage in garbage out by @davidhewitt in https://github.com/pydantic/monty/pull/873
• Fix async task scheduling for batched host failures by @flyingmutant in https://github.com/pydantic/monty/pull/875
• Give each callable type its own PyTrait::py_call by @rewitt94 in https://github.com/pydantic/monty/pull/878
• Flat layout for wire value type by @samuelcolvin in https://github.com/pydantic/monty/pull/871
• Serialize dumps after the header in place, without a second buffer by @samuelcolvin in https://github.com/pydantic/monty/pull/881
• Shrink the largest dag decode bench to fit the decode budget by @samuelcolvin in https://github.com/pydantic/monty/pull/883
• remove needless SOFT_LIMIT variable from monty-alloc by @davidhewitt in https://github.com/pydantic/monty/pull/763
• Add time.time(), time.sleep() and asyncio.sleep() by @samuelcolvin in https://github.com/pydantic/monty/pull/866
• expose otel trace context from snapshots by @davidhewitt in https://github.com/pydantic/monty/pull/885
• purge pool-architecture.md by @davidhewitt in https://github.com/pydantic/monty/pull/887
• Replace session max_duration with feed and turn limits by @rewitt94 in https://github.com/pydantic/monty/pull/880
• add a general solution for wire decoding budgets by @davidhewitt in https://github.com/pydantic/monty/pull/874
• try to hide object internals by @davidhewitt in https://github.com/pydantic/monty/pull/886
• fix merge conflict by @davidhewitt in https://github.com/pydantic/monty/pull/891
• Comment and documentation fixes by @rewitt94 in https://github.com/pydantic/monty/pull/888
• Sort StaticStrings alphabetically by @rewitt94 in https://github.com/pydantic/monty/pull/889
• Change DumpError for future compatibility by @rewitt94 in https://github.com/pydantic/monty/pull/890
• Implement eval(), exec() and locals() by @samuelcolvin in https://github.com/pydantic/monty/pull/855
• Auto OS calls by @samuelcolvin in https://github.com/pydantic/monty/pull/892
• Use sleep and random in the antigravity example by @samuelcolvin in https://github.com/pydantic/monty/pull/897
• Timezone support by @samuelcolvin in https://github.com/pydantic/monty/pull/898
• Poll the time limit in large three-argument pow by @samuelcolvin in https://github.com/pydantic/monty/pull/899
• Reject overlapping host directories at mount registration by @samuelcolvin in https://github.com/pydantic/monty/pull/741
• Extend time module by @samuelcolvin in https://github.com/pydantic/monty/pull/901
• Replace wire types with whitelist of allowed types, and proxy for everything else by @samuelcolvin in https://github.com/pydantic/monty/pull/900
• Rename AutoOsCalls to OsPolicy by @samuelcolvin in https://github.com/pydantic/monty/pull/902
• Resolve exception classes directly and model them inbound by @samuelcolvin in https://github.com/pydantic/monty/pull/905
• Describe Monty as a sandbox and name the open-source form "OSS Monty" by @samuelcolvin in https://github.com/pydantic/monty/pull/904
• Uprev ruff, pre-check source by @samuelcolvin in https://github.com/pydantic/monty/pull/906
• Bump to v1.0.0-beta.1 by @samuelcolvin in https://github.com/pydantic/monty/pull/903

New Contributors

• @Kludex made their first contribution in https://github.com/pydantic/monty/pull/832
• @flyingmutant made their first contribution in https://github.com/pydantic/monty/pull/875

Full Changelog: https://github.com/pydantic/monty/compare/v1.0.0-beta.1...v1.0.0-beta.2