[issue16398] deque.rotate() could be much faster

[Roundup Robot]

Roundup Robot added the comment:

New changeset efb8d80af320 by Raymond Hettinger in branch 'default':
Issue 16398:  Add assertions to show why memcmp is safe.
http://hg.python.org/cpython/rev/efb8d80af320

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16398>
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