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Use collections.abc.Reversible if it exists - #194
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if it exists. Also if it exists Reversible is a subclass of Iterable, and Sequence is subclass of Reversible.
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Reversible is not always a protocol (it is a generic ABC if collections.abc.Reversible exists), but SupportsAbs is always a protocol.
Again, Reversible could not be a protocol.
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Fixes #172 . I assumed that if Reversible is present in collections.abc then it means that http://bugs.python.org/issue25987 is resolved as Andrew Barnert proposes (as I understand @gvanrossum agrees with this), i.e., Sequence is subclass of Reversible, and not directly of Iterable.