[issue23573] Avoid redundant allocations in str.find and like

[Roundup Robot]

Roundup Robot added the comment:

New changeset 311a4d28631b by Serhiy Storchaka in branch '3.5':
Issue #23573: Restored optimization of bytes.rfind() and bytearray.rfind()
https://hg.python.org/cpython/rev/311a4d28631b

New changeset c06410c68217 by Serhiy Storchaka in branch 'default':
Issue #23573: Restored optimization of bytes.rfind() and bytearray.rfind()
https://hg.python.org/cpython/rev/c06410c68217

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<http://bugs.python.org/issue23573>
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