[issue39944] UserString.join should return UserString

[Dennis Sweeney]

Dennis Sweeney <sweeney.dennis650 at gmail.com> added the comment:

This is not a duplicate: issue16397 concerned

   " ".join([US("a"), US("b")])

While this is concerned about the return value and acceptable parameters for UserString.join().

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