attrs.evolve: support generics and unions #15050
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ikonst
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@hauntsaninja since you also reviewed #15022 I looked into existing code (checkmember, meet) but didn't find anything that did quite that, but |
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👋 @hauntsaninja (trying to make it more readable, but it's really not too scary) |
This was referenced Apr 18, 2023
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
I believe there's already |
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Fixes
attrs.evolvesignature generation to support theinstparameter beingIn the case of unions, we "meet" the fields of the potential attrs classes, so that the resulting signature is the lower bound.
Fixes #15088.