Alexey Izbyshev <> 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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