[Feature request] Add -u option to git rm to delete untracked files

Hello All,

Would it be feasible to add a -u option to git rm to specify that I also want a file deleted if it is not tracked by git? Currently, git rm -f can remove files in whatever state it seems, except when it is untracked.  By allowing a -u option (-u: also delete untracked files) I would be sure that the file is gone while it would also make sure that it doesn't break past behaviour where people perhaps rely on git rm to leave untracked files alone.

Kind regards,

Erik Janssen.