Bug fixes

• Guard descriptor classification cycles (#26690)
• Respect init=False in dataclass field-order checks (#26749)
• Avoid duplicate diagnostics for overloaded TypeIs (#26716)

Library support

• Pydantic: Support custom init methods (#26699)
• Pydantic: Support field metadata in Annotated (#26650)

Core type checking

• Allow unsound equality-based narrowing for builtins (#26414)
• Bind Self in implicit dunder calls (#26711)
• Correct protocol method receiver binding (#26701)
• Exempt ParamSpec callables from the dunder descriptor heuristic (#26696)
• Remove transitive TypeVar artifacts during collection inference (#26714)

LSP server

• Avoid broad invalidation from file check eligibility (#26741)
• Correct how we expand tabs in docstrings (#26679)
• Resolve ambiguity in Google-style docstring parsing in favour of observations from popular projects (#26673)

CLI

• Avoid allocation for every stdout write (#26698)
• Buffer diagnostic output (#26702)

Performance

• Cache generic context (#26745)
• Cache known class instances (#26746)
• Reuse common TypedDict constraints through intersections (#26747)
• Use purpose-specific types for completion and module text (#26664)

Contributors

• @carljm
• @MichaReiser
• @charliermarsh
• @lerebear
• @ibraheemdev
• @sharkdp