INADA Naoki <> added the comment:

> 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).

Sorry, I can't get what is your point.
I don't want to change ABC behavior for now.  I want to make C implementation 
consistent with Python implementation, except some (unrealistic) corner cases.


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