[issue39944] UserString.join should return UserString

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

This API is very old and doesn't seem to have a caused any issues in practice.  Changing the API now is more likely to break existing code than to help anyone in the future.

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