[issue12805] Optimizations for bytes.join() et. al

[Roundup Robot]

Roundup Robot added the comment:

New changeset bfa715f98c0f by Antoine Pitrou in branch 'default':
Issue #12805: Make bytes.join and bytearray.join faster when the separator is empty.
http://hg.python.org/cpython/rev/bfa715f98c0f

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nosy: +python-dev

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