A '-' or '--' argument signals the end of bash's own options. All
remaining arguments are treated as filenames and arguments. We shouldn't
perform any additional argument processing once we see this signal.
We could also assume a non-interactive shell session in this case unless
the '-i' (interactive) shell option has been explicitly specified, but
let's wait on that until we know that doing so would solve a real user
problem (and avoid any false negatives).
a2018d7b20