PEP 484: Remove statement about unicode, in the python2.7 section. by matthiaskramm · Pull Request #302 · python/peps
See python/typing#418 (comment). Let's leave it up to type-checkers whether they want `unicode`, in Python 2 code, to mean "only unicode" or "str or unicode".
gvanrossum pushed a commit to python/typeshed that referenced this pull request
Jul 18, 2017
This documents, among others, the unicode -> Union[bytes, unicode] promotion that python/peps#302 removes from PEP 484.
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