Actually, the double-dash actually tells Getopt::Long to consider anything following an argument, regardless of whether it looks like an option or not. (The parser simply stops looking at all.) So your original assertion that options are removed but arguments are left can be considered correct, and IMHO is more correct than your nitpick, though it is of course incomplete without mentioning the function of the double-dash.

Sure, I am arguing semantics, but I wasn't the one who started nitpicking, now was I? ;-)