[issue27458] Allow subtypes of unicode/str to hit the optimized unicode_concatenate block

[Ammar Askar]

Changes by Ammar Askar <ammar at ammaraskar.com>:


Removed file: http://bugs.python.org/file43631/python.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27458>
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