[issue47261] RFC: Clarify Limited API macros for PySequence_Fast

[Rohit Goswami]

Rohit Goswami <rog32 at hi.is> added the comment:

Perhaps to be clear, there are two possibilities:
1. `PySequence_Fast` should be removed from the Limited API
2. All macros used with `PySequence_Fast` are valid for use in the context of the Limited API

In either case the documentation should need to be clarified.

The only situation where no changes would result is if:
- `PySequence_Fast` is part of the Limited API, but must be treated the same as a regular `PySequence` object
  + Since only `PySequence_Size` and other variants can be used in the context of the Limited API

This is actually also still confusing and should be mentioned clearly.

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<https://bugs.python.org/issue47261>
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