Some reason rdmd uses -v instead of -deps?

[Nick Sabalausky via Digitalmars-d]

Does anyone know why RDMD collects dependencies using "-v" instead of 
"-deps"?

I was thinking of doing a PR to switch it to -deps as that would help 
solve a couple problems, but I'm not sure if there's already some reason 
why it's using -v instead. (I could've sworn it used to use -deps at 
some point years ago.)