[issue31750] expose PyCell_Type in types module

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I think the cell type is pretty fundamental to Python's semantic model. IIRC there once was a time when cells were entirely hidden from the user, but that's no longer true. Third-party code that uses them might want to have type annotations and then it's a pain when there's no way to talk about them. And no, that doesn't mean it belongs in typing.py -- that's not a scalable model, and in general we only want to shadow things there that must be generic (but aren't in types.py), like `List` or `re.Pattern`.

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<https://bugs.python.org/issue31750>
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