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The documentation explaining Python's data model does not adequately explain the differences between ``__getitem__`` and ``__class_getitem__``, nor does it explain when each is called. There is an attempt at explaining ``__class_getitem__`` in the documentation for ``GenericAlias`` objects, but this does not give sufficient clarity into how the method works. Moreover, it is the wrong place for that information to be found; the explanation of ``__class_getitem__`` should be in the documentation explaining the data model. This PR has been split off from GH-29335. (cherry picked from commit 31b3a70edb1216bdc8fab3b2eafd8ddb00487f41) Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com> Co-authored-by: Łukasz Langa <lukasz@langa.pl>