exports is annotated as dict[str, str | tuple[str, str]] (plus the iterable case). Because dict is invariant, passing a simple dict[str, str] actually produces a mypy error! Users can work around this by manually annotating the data as dict[str, str | tuple[str, str]], but this is very unergonomic.

https://mypy-play.net/?mypy=latest&python=3.12&gist=7194ebea2b603890033453b8d735e232 is a minimal demonstration of this issue, and the recommended workaround: annotating the value as collections.Mapping instead.