[heavyset_go]

Type annotations are just hints and aren't enforced at runtime. You can pass whatever you want into that function, and you can also create a union type with the Fraction if you want the annotations to match your application.

[pansa2]

> You can pass whatever you want into that function

Not really. Doing so won't cause an error at runtime, but it will produce an error when you run the type checker.

[musicale]

You seem to have removed the previous sentence which qualified the statement as "at runtime."

[pansa2]

How can I pass whatever I want into that function at runtime, while still satisfying the type checker?

[dragonwriter]

> How can I pass whatever I want into that function at runtime, while still satisfying the type checker?

Tell the type-checker to buzz-off by any number of means, including # type: ignore

[_flux]

You can use the Any type, or you can not annotate at all, though I'm not sure if the latter is something that passes some stricter modes of e.g. mypy.