[issue29634] Reduce deque repeat execution when maxlen exist and size is not 1

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

There is an opportunity of further optimisation. For example deque(range(100000), maxlen=100001) *= 2 copies 100000 elements while it is enough to copy just 1 element. But I don't know whether it is worth to optimise this.

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<http://bugs.python.org/issue29634>
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