[issue32449] MappingView must inherit from Collection instead of Sized

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Well, it would be a backward compatibility problem at a minimum.

Obviously things were designed this way.  Have you found out why?  Is there a consensus on python-ideas that this should be changed?  If so, please link to the thread.

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nosy: +r.david.murray

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