[issue19801] Concatenating bytes is much slower than concatenating strings

[R. David Murray]

R. David Murray added the comment:

It is definitely not a good idea to rely on that optimization of += for string.  Obviously bytes doesn't have the same optimization.  (String didn't either for a while in Python3, and there was some controversy around adding it back exactly because one should not rely on it.)

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nosy: +r.david.murray

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<http://bugs.python.org/issue19801>
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