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

[Serhiy Storchaka]

Serhiy Storchaka <storchaka at gmail.com> added the comment:

> Regardless of whether optimization (which is negligible in this case), I don't know whether to consider such side effect desirable or undesirable.

After some thought, I realized that this is an erroneous behavior.

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<http://bugs.python.org/issue12805>
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