[issue42001] Deprecate `typing.io` Wrapper Namespace

[Sebastian Rittau]

Sebastian Rittau <srittau at rittau.biz> added the comment:

For reference, this came up in https://github.com/python/typeshed/issues/4639#issuecomment-706596656. `typing.io` has never been in typeshed and we decided not to include it. It looks as if it never gained any traction, especially since the types are available from `typing` directly.

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nosy: +srittau

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