[issue41810] Consider reintroducing `types.EllipsisType` for the sake of typing

[Guido van Rossum]

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

> In any case, I'm ok with adding `NoneType` and `NotImplementedType` to the PR.

Please do.

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<https://bugs.python.org/issue41810>
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