Open requested to merge branch/py3.9-type-or into branch/py3.9
__or__ operator to
GenericAlias. Also had to import some of the changes
lib-python/3/typing.py, and unfortunately had to diverge a little in the
_UnionGenericAlias.__repr__ implementation to avoid duplicating the
Union implementation as CPython did in C.
--HG-- branch : py3.9-type-or