Sync typeshed #20080
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Sync typeshed #20080
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Source commit: python/typeshed@11c7821
This is allegedly causing large performance problems, see 13821 typeshed/8231 had zero hits on mypy_primer, so it's not the worst thing to undo. Patching this in typeshed also feels weird, since there's a more general soundness issue. If a typevar has a bound or constraint, we might not want to solve it to a Literal. If we can confirm the performance regression or fix the unsoundness within mypy, I might pursue upstreaming this in typeshed. (Reminder: add this to the sync_typeshed script once merged)
… checking: python#13987 (comment) A manual cherry-pick of e437cdf.
misc/typeshed_patches/0001-Revert-Remove-redundant-inheritances-from-Iterator.patch
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JelleZijlstra
approved these changes
Oct 16, 2025
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Diff from mypy_primer, showing the effect of this PR on open source code: pydantic (https://github.com/pydantic/pydantic)
+ pydantic/errors.py:131: error: Argument "name" to "PydanticUndefinedAnnotation" has incompatible type "str | None"; expected "str" [arg-type]
altair (https://github.com/vega/altair)
+ altair/utils/execeval.py:81: error: Argument "filename" to "compile" has incompatible type "str | Buffer | PathLike[Any]"; expected "str | bytes | PathLike[Any]" [arg-type]
+ altair/utils/execeval.py:87: error: Argument "filename" to "compile" has incompatible type "str | Buffer | PathLike[Any]"; expected "str | bytes | PathLike[Any]" [arg-type]
sphinx (https://github.com/sphinx-doc/sphinx)
+ sphinx/ext/autodoc/type_comment.py:121: error: Unused "type: ignore" comment [unused-ignore]
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Mypy primer hits |
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Source commit:
python/typeshed@11c7821