Alexey Izbyshev <izbys...@ispras.ru> added the comment:
OK, making a new implementation behave as the old one is fine with me too.
BTW, do TypeErrors related to weak references deserve any treatment? Isn't it a
kind of coincidence that the error raised due to usage of WeakSet in
issubclass(obj, ABC) is what we expect? (Sorry, I'm not familiar with WeakSets).
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