[issue18468] re.group() should never return a bytearray

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Here is a patch with an implementation and tests. Feel free to add a documentation changes if needed.

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stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18468>
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