Fix TypeIs narrowing for covariant generic Any#21662
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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Fixes #21641.
Summary
TypeIschecks according to declared variance.TypeIs[Source[object]]narrow awaySource[Any]whenSourceis covariant.Box[Any]is not removed byTypeIs[Box[str]].Tests
python runtests.py check-typeispython runtests.py check-typeguard check-narrowingpython -m pytest mypy/test/testsubtypes.py -qpython -m mypy --config-file mypy_self_check.ini mypy/subtypes.pypython -m ruff check mypy/subtypes.pypython -m black --check mypy/subtypes.pygit diff --checkPrepared with AI assistance.