[issue15958] bytes.join() should allow arbitrary buffer objects

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Patch LGTM, however...
> 
> $ ./python -m timeit -s "a=[b'a']*100000"  "b','.join(a)"
> 
> Vanilla: 3.69 msec per loop
> Patched: 11.6 msec per loop

True. It is a bit of a pathological case, though.

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<http://bugs.python.org/issue15958>
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