`batman` does not handle combined short flags (e.g. `-wa`)

If I run `batman -w -a bash` it correctly shows me all `bash` locations in my `PATH`. But if I combine the flags, it only obeys the first flag in the list and ignores the rest, meaning it treats `batman -wa bash` the same as `batman -w bash` (just shows one location) and `batman -aw bash` the same thing as `batman -a bash`.