[issue45359] TopologicalSorter is not Generic at runtime (but is in typeshed)

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

`if TYPE_CHECKING:` is a good choice, it works fine just now.
`from __future__ import annotations` is another alternative.

I don't see a reason for REMOVING already existing and correct annotations from typeshed.

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<https://bugs.python.org/issue45359>
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