Make BaseException.__new__ cls positional-only#16066
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JelleZijlstra merged 1 commit intoJul 22, 2026
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
carljm
marked this pull request as ready for review
July 22, 2026 01:43
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Make the
clsparameter ofBaseException.__new__positional-only. CPython acceptsBaseException.__new__(Exception, cls=int)and rejectsBaseException.__new__(cls=Exception), so the existing positional-or-keyword annotation incorrectly treats a validclskeyword forwarded through**kwdsas a duplicate argument.