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

[Alex Waygood]

Alex Waygood <Alex.Waygood at Gmail.com> added the comment:

Another option for code using Python <3.11, that will work without the `from __future__ import annotations` import, is to do something like this:

```
from graphlib import TopologicalSorter
x: 'TopologicalSorter[str]' = TopologicalSorter({"a": {}, "b": {"a"}})
```

By using a string as the annotation, we give mypy the specificity it needs, but the expression will never need to be resolved at runtime.

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nosy: +AlexWaygood
type: behavior -> enhancement

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