[issue27598] Add SizedIterable to collections.abc and typing

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

Thank you Neil, I agree that Sequence is a reversible collection.

I combined you documentation patch with updated _collections_abc and updated test_functools (it tests MRO) into a single patch.

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Added file: http://bugs.python.org/file44148/collection_neil_combined.diff

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