Avoid spurious non-overlapping eq error with metaclass with __eq__
#19220
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Currently, doing an `==` on a `type[Foo]` where `Foo` has a metaclass that defines `__eq__` will spurious produce a non-overlapping equality error, because `custom_special_method`, a helper used in the check, does not consider the `TypeType` case. Fix that.
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Diff from mypy_primer, showing the effect of this PR on open source code: antidote (https://github.com/Finistere/antidote): 1.32x slower (69.4s -> 91.5s in single noisy sample)
janus (https://github.com/aio-libs/janus): 1.63x faster (10.8s -> 6.6s in single noisy sample)
AutoSplit (https://github.com/Toufool/AutoSplit): 1.05x faster (111.7s -> 106.3s in single noisy sample)
mypy (https://github.com/python/mypy): 1.06x slower (108.7s -> 115.2s in single noisy sample)
discord.py (https://github.com/Rapptz/discord.py): 1.09x slower (266.6s -> 290.9s in single noisy sample)
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ilevkivskyi
approved these changes
Jun 4, 2025
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Currently, doing an
==on atype[Foo]whereFoohas a metaclassthat defines
__eq__will spuriously produce a non-overlapping equalityerror, because
custom_special_method, a helper used in the check,does not consider the
TypeTypecase.Fix that.