[issue36229] Avoid unnecessary copies for list, set, and bytearray ops.

[Armin Rigo]

Armin Rigo <arigo at users.sourceforge.net> added the comment:

...or PySequence_Concat() instead of PyNumber_Add(); same reasoning.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36229>
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