Version 2.4.2

This patch release fixes a cluster of bugs in async rx pipelines (stale value propagation, cancellation leaks, branching, invalidation finalizers, and an unhandled exception in async operations), plus a memory leak on short-lived reactive pipelines, a thread-safety issue in the Parameter init cache, and a List item_type validation bug rejecting subclasses with a custom metaclass.

Many thanks to @philippjfr, @hoxbro, @maximlt, @s-t-e-v-e-n-k and @Coderambling for their contributions to this release.

🐛 Bug Fixes

• Fix memory leak on short-lived reactive pipelines (#1156)
• Fix List item_type validation rejecting subclasses with a custom metaclass (#1166)
• Switch to os.path.commonpath to fix FileSelector path abbreviation splitting on partial path components (#1165)
• Fix thread-unsafe init cache rebuild and unmask errors (#1171)
• Stop rx from propagating a stale value while an async node is awaiting (#1173)
• Fix rx invalidation finalizer keeping its own node alive (#1174)
• Fix superseded async references escaping cancellation (#1175)
• Fix branching off an async rx node (#1178)
• Fix an unhandled exception in an async rx operation (#1179)
• Fix async_executor leaking an event loop per call and leaking cancellations (#1180)

📚 Documentation

• A few minor text optimizations in Typing.ipynb (#1161)

🧪 Tests & CI

• Bump pyrefly compat to 1.1.0 (#1157)
• Run type CI in parallel (#1158)
• Fix feather serialization tests (#1168)
• Ignore python 3.10 for feather test (#1169)
• Update CI action versions (#1170)
• Ignore gmpy2 on Windows for now (#1172)