[3.9] bpo-42345: Fix three issues with typing.Literal parameters (GH-23294) by uriyyo · Pull Request #23335 · python/cpython

Literal equality no longer depends on the order of arguments.

Fix issue related to typing.Literal caching by adding typed parameter to typing._tp_cache function.

Add deduplication of typing.Literal arguments.

(cherry picked from commit f03d318)

Co-authored-by: Yurii Karabas 1998uriyyo@gmail.com

https://bugs.python.org/issue42345

Automerge-Triggered-By: GH:gvanrossum