[issue3460] PyUnicode_Join could perhaps be simpler

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Well the potentially dangerous function would have been
PyUnicode_FromObject, but in py3k it only accepts unicode instances
(either exact or subclasses), and since we are only interested in the
underlying buffer we can replace those calls with PyUnicode_Check.
I'll work on a patch and keep you updated.

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assignee:  -> pitrou

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