I've seen a lot of cli's where verbosity can be controlled by repeating a -v flag. So either -v -v -v or -vvv (though the latter seems less common).

I've been trying to emulate this using a converter but since the verbosity is defined as an int, the -v parameter seems to always expect a value.

A cherry on top would be the case where a single occurance of -v could optionally accept a value so the 2 options would be possible at the same time