This issue only affects the type hint given to therev parameter, as passingNone to the function does work and gives the expected behavior, which is running thegit blame -p -- <file> command without a revision, which gives back the blameincluding changes to the local working directory that haven't been committed yet.

While the code works at runtime, language servers such as pylance give back an error, asNone is not a valid type according to the type hints.