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Update CHANGELOG.md with draft for release 1.10 (#17150)
Initial pass at blog post for Release 1.10. Still need to add some information about the major changes. Pulled up 3 commits that seemed like we might want to write something about (under TODO), but they can move them to "Other Notable Changes and Fixes" if that's not the case.
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‎CHANGELOG.md

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# Mypy Release Notes
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## Next release
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## Mypy 1.10 (Unreleased)
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We’ve just uploaded mypy 1.10 to the Python Package Index ([PyPI](https://pypi.org/project/mypy/)). Mypy is a static type checker for Python. This release includes new features, performance improvements and bug fixes. You can install it as follows:
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python3 -m pip install -U mypy
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You can read the full documentation for this release on [Read the Docs](http://mypy.readthedocs.io).
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**TODO**
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- Implement TypeIs (PEP 742) (Jelle Zijlstra, PR [16898](https://github.com/python/mypy/pull/16898))
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- Error handling for recursive TypeVar defaults (PEP 696) (Marc Mueller, PR [16925](https://github.com/python/mypy/pull/16925))
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- Add basic support for recursive TypeVar defaults (PEP 696) (Marc Mueller, PR [16878](https://github.com/python/mypy/pull/16878))
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#### Other Notable Changes and Fixes
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- fix: incorrect returned type of access descriptors on unions of types (Matthieu Devlin, PR [16604](https://github.com/python/mypy/pull/16604))
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- Fix crash when expanding invalid Unpack in a `Callable` alias (Ali Hamdan, PR [17028](https://github.com/python/mypy/pull/17028))
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- Fix string formatting for string enums (roberfi, PR [16555](https://github.com/python/mypy/pull/16555))
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- Narrow individual items when matching a tuple to a sequence pattern (Loïc Simon, PR [16905](https://github.com/python/mypy/pull/16905))
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- Add TypeGuard and TypeIs traversing in TypeTraverserVisitor (Evgeniy Slobodkin, PR [17071](https://github.com/python/mypy/pull/17071))
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- Improve error message for bound typevar in TypeAliasType (Ali Hamdan, PR [17053](https://github.com/python/mypy/pull/17053))
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- Fix TypedDict init from Type with optional keys (Marc Mueller, PR [17068](https://github.com/python/mypy/pull/17068))
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- Improve yield from inference for unions of generators (Shantanu, PR [16717](https://github.com/python/mypy/pull/16717))
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- Support `TypeAliasType` in a class scope (Ali Hamdan, PR [17038](https://github.com/python/mypy/pull/17038))
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- attrs: Fix emulating hash method logic (Hashem, PR [17016](https://github.com/python/mypy/pull/17016))
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- Use lower-case generics more consistently in error messages (Jukka Lehtosalo, PR [17035](https://github.com/python/mypy/pull/17035))
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- Revert "Revert use of `ParamSpec` for `functools.wraps`" (Tamir Duberstein, PR [16942](https://github.com/python/mypy/pull/16942))
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- Support `TypeAliasType` (Ali Hamdan, PR [16926](https://github.com/python/mypy/pull/16926))
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- Fix type narrowing for types.EllipsisType (Shantanu, PR [17003](https://github.com/python/mypy/pull/17003))
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- Disallow all super calls to methods with trivial bodies (Shantanu, PR [16756](https://github.com/python/mypy/pull/16756))
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- Fix single item enum match type exhaustion (Oskari Lehto, PR [16966](https://github.com/python/mypy/pull/16966))
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- Fix inference with UninhabitedType (Marc Mueller, PR [16994](https://github.com/python/mypy/pull/16994))
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- Allow TypedDict initialization from Type (Marc Mueller, PR [16963](https://github.com/python/mypy/pull/16963))
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- Fix override checking for decorated property (Shantanu, PR [16856](https://github.com/python/mypy/pull/16856))
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- Fix duplicate word in protocols.rst (hesam, PR [16950](https://github.com/python/mypy/pull/16950))
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- Workaround parenthesised context manager issue (Shantanu, PR [16949](https://github.com/python/mypy/pull/16949))
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- Fix narrowing on match with function subject (Edward Paget, PR [16503](https://github.com/python/mypy/pull/16503))
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- Allow inferring +int to be a Literal (Spencer Brown, PR [16910](https://github.com/python/mypy/pull/16910))
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#### Stubgen Improvements
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- stubgen: Preserve empty tuple annotation (Ali Hamdan, PR [16907](https://github.com/python/mypy/pull/16907))
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- stubgen: Add support for PEP 570 positional-only parameters (Ali Hamdan, PR [16904](https://github.com/python/mypy/pull/16904))
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- stubgen: Replace obsolete typing aliases with builtin containers (Ali Hamdan, PR [16780](https://github.com/python/mypy/pull/16780))
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- stubgen: Fix generated dataclass `__init__` signature (Ali Hamdan, PR [16906](https://github.com/python/mypy/pull/16906))
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#### Stubtest Improvements
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- stubtest: correct type annotations in _Arguments (Sam Xifaras, PR [16897](https://github.com/python/mypy/pull/16897))
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#### Mypyc Improvements
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- [mypyc] Refactor: add two list primitive ops (Jukka Lehtosalo, PR [17058](https://github.com/python/mypy/pull/17058))
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- [mypyc] Refactor: use primitive op for initializing list item (Jukka Lehtosalo, PR [17056](https://github.com/python/mypy/pull/17056))
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- [mypyc] Refactor: move tagged int related code to mypyc.lower.int_ops (Jukka Lehtosalo, PR [17052](https://github.com/python/mypy/pull/17052))
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- [mypyc] Implement lowering for remaining tagged integer comparisons (Jukka Lehtosalo, PR [17040](https://github.com/python/mypy/pull/17040))
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- [mypyc] Implement lowering pass and add primitives for int (in)equality (Jukka Lehtosalo, PR [17027](https://github.com/python/mypy/pull/17027))
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- [mypyc] Optimize away some bool/bit registers (Jukka Lehtosalo, PR [17022](https://github.com/python/mypy/pull/17022))
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- [mypyc] Provide an easier way to define IR-to-IR transforms (Jukka Lehtosalo, PR [16998](https://github.com/python/mypy/pull/16998))
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- [mypyc] Remangle redefined names produced by async with (Richard Si, PR [16408](https://github.com/python/mypy/pull/16408))
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- [mypyc] Optimize TYPE_CHECKING to False at Runtime (Srinivas Lade, PR [16263](https://github.com/python/mypy/pull/16263))
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- [mypyc] Fix compilation of unreachable comprehensions (Richard Si, PR [15721](https://github.com/python/mypy/pull/15721))
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- [mypyc] Don't crash on non-inlinable final local reads (Richard Si, PR [15719](https://github.com/python/mypy/pull/15719))
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#### Documentation Improvements
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- Update running_mypy.rst add closing bracket (Roman Solomatin, PR [17046](https://github.com/python/mypy/pull/17046))
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- Docs: docstrings in checker.py, ast_helpers.py (Ihor, PR [16908](https://github.com/python/mypy/pull/16908))
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- docs: Add missing ClassVar import (youkaichao, PR [16962](https://github.com/python/mypy/pull/16962))
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- Docs: Update `TypedDict` import statements (Riccardo Di Maio, PR [16958](https://github.com/python/mypy/pull/16958))
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- Docs: adding missing `mutable-override` to section title (James Braza, PR [16886](https://github.com/python/mypy/pull/16886))
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#### Acknowledgements
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Thanks to all mypy contributors who contributed to this release:
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- Alex Waygood
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- Ali Hamdan
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- Edward Paget
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- Evgeniy Slobodkin
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- Hashem
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- hesam
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- Hugo van Kemenade
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- Ihor
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- James Braza
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- Jelle Zijlstra
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- jhance
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- Jukka Lehtosalo
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- Loïc Simon
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- Marc Mueller
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- Matthieu Devlin
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- Michael R. Crusoe
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- Nikita Sobolev
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- Oskari Lehto
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- Riccardo Di Maio
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- Richard Si
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- roberfi
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- Roman Solomatin
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- Sam Xifaras
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- Shantanu
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- Spencer Brown
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- Srinivas Lade
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- Tamir Duberstein
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- youkaichao
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I’d also like to thank my employer, Dropbox, for supporting mypy development.
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## Mypy 1.9
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We’ve just uploaded mypy 1.9 to the Python Package Index ([PyPI](https://pypi.org/project/mypy/)). Mypy is a static type checker for Python. This release includes new features, performance improvements and bug fixes. You can install it as follows:

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