Serhiy Storchaka added the comment:

> Does your deque-like implementation preserve O(1) deletion?

Ah, OrderedDict should provide O(1) deletion for arbitrary key. Then deque-
like implementation should use variable-size chunks and rotate_at() / 
rotate_after() are possible with O(1).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17100>
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