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bpo-42345: Add whatsnew and versionchanged for typing.Literal in 3.9 (GH-23386)

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* Whatsnew entry in 3.9 same as the one in 3.10.
* versionchanged for typing.Literal docs

Needs backport to 3.9.
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kj 2020-11-20 00:37:26 +07:00 • committed by GitHub
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Doc/library/typing.rst
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@ -674,6 +674,12 @@ These can be used as types in annotations using ``[]``, each having a unique syn
.. versionadded:: 3.8
.. versionchanged:: 3.9.1
``Literal`` now de-duplicates parameters. Equality comparison of
``Literal`` objects are no longer order dependent. ``Literal`` objects
will now raise a :exc:`TypeError` exception during equality comparisons
if one of their parameters are not :term:`immutable`.
.. data:: ClassVar
Special type construct to mark class variables.