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The key thing with the docs is that it doesn't say anywhere "takes a string path" or a "path as a string" or something else that suggests path-like objects don't work. If you want to clearly state that path-like objects are acceptable that is fine as well.
As for the bytes/str parts, path-like objects that return bytes should work, but only if everything is str or bytes as passed into the function (e.g. mixing the types should not be expected to work).