[issue23793] Support __add__, __mul__, and __imul__ for deques.

[Roundup Robot]

Roundup Robot added the comment:

New changeset b75160d24b7b by Raymond Hettinger in branch 'default':
Issue 23793:  Add deque support for __add__(), __mul__(), and __imul__().
https://hg.python.org/cpython/rev/b75160d24b7b

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nosy: +python-dev

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<http://bugs.python.org/issue23793>
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