Tighten metaclass __call__ handling in protocols #19191
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Diff from mypy_primer, showing the effect of this PR on open source code: nox (https://github.com/wntrblm/nox): 1.27x slower (25.1s -> 32.0s in single noisy sample)
typeshed-stats (https://github.com/AlexWaygood/typeshed-stats): 1.64x slower (57.9s -> 95.1s in single noisy sample)
materialize (https://github.com/MaterializeInc/materialize): 1.05x slower (134.2s -> 141.0s in single noisy sample)
scikit-build-core (https://github.com/scikit-build/scikit-build-core): 1.11x slower (42.7s -> 47.6s in single noisy sample)
discord.py (https://github.com/Rapptz/discord.py): 1.05x faster (306.2s -> 290.3s in single noisy sample)
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hauntsaninja
approved these changes
Jun 1, 2025
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JukkaL
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that referenced
this pull request
Jun 11, 2025
Fixes #19184 This fixes an (edge-case) regression introduced in 1.16. Fix is straightforward, only ignore `__call__` if it comes from an _actual_ metaclass.
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Fixes #19184
This fixes an (edge-case) regression introduced in 1.16. Fix is straightforward, only ignore
__call__if it comes from an actual metaclass.