[issue27802] Add __eq__ and __ne__ to collections.abc.Sequence.

[Martin Panter]

Martin Panter added the comment:

Your implementation looks like it will make a Sequence equal to a list and a tuple, even though lists and tuples are never equal to each other.

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nosy: +martin.panter
type:  -> enhancement

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<http://bugs.python.org/issue27802>
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