[issue26915] Test identity first in membership operation of ItemsView, ValuesView and Sequence in collections.abc

[Xiang Zhang]

Xiang Zhang added the comment:

I agree with you josh. Actually that's what I want to know, consistency. But I don't mention it in my post, so Guido only gives what to do in this case. In this thread, it means does Python code have to keep the invariant mentioned in msg75735?

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<http://bugs.python.org/issue26915>
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