Path not supported for some path arguments

[AlexandreKempf]

Most of the path arguments handle both str and pathlib.Path object.

It is not the case for Live's dvcyaml while it should probably be.

[AbdullahMakhdoom]

Hi @dberenbaum, I'm interested in contributing to dvclive, and I believe this issue is a great starting point.
If I'm not mistaken, it appears that the Live's dvcyaml argument should also accept pathlib.Path objects. Therefore, the argument should be defined as dvcyaml: Optional[Union[str, pathlib.Path]] = "dvc.yaml"
Could you confirm if my understanding is correct?

[dberenbaum]

If I'm not mistaken, it appears that the Live's dvcyaml argument should also accept pathlib.Path objects.

Correct.

Therefore, the argument should be defined as dvcyaml: Optional[Union[str, pathlib.Path]] = "dvc.yaml"

Partially correct. Fixing the type hint would be nice, but the underlying issue goes deeper. If you try an example with dvcyaml set to some pathlib.Path value, you should see where it breaks. This issue is to fix any underlying problems so that pathlib.Path values work.