[issue30146] Difference in behavior between set() and collections.abc.MutableSet() derived objects

[R. David Murray]

R. David Murray added the comment:

I suppose someone could propose a set of tests that an implementation of an ABC type should pass, to complement the stdlib type tests.  There would probably be a lot of bikeshedding involved in such tests though, so I don't hold out great hope anything would ever get accepted for merge :)

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<http://bugs.python.org/issue30146>
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