[issue39944] UserString.join should return UserString

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

You are right. Sorry.

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stage: resolved -> patch review
superseder: UserString doesn't combine nicely with strings -> 

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39944>
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