[issue21377] PyBytes_Concat could try to concat in-place

[STINNER Victor]

STINNER Victor added the comment:

If I remember correctly, ceval.c has an optmisation for str += str even if
the refcount is 2. Do we need to implement it or suggest to use bytearray
or b''.join() instead?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21377>
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