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[3.12] gh-113313: Note that slice support is not required for all sequences. (gh-113377) (gh-113382)

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@ -2803,9 +2803,9 @@ through the object's keys; for sequences, it should iterate through the values.
.. method:: object.__getitem__(self, key)
Called to implement evaluation of ``self[key]``. For :term:`sequence` types,
the accepted keys should be integers and slice objects. Note that the
special interpretation of negative indexes (if the class wishes to emulate a
:term:`sequence` type) is up to the :meth:`__getitem__` method. If *key* is
the accepted keys should be integers. Optionally, they may support
:class:`slice` objects as well. Negative index support is also optional.
If *key* is
of an inappropriate type, :exc:`TypeError` may be raised; if *key* is a value
outside the set of indexes for the sequence (after any special
interpretation of negative values), :exc:`IndexError` should be raised. For