Got it, I see. I guess I'd prefer to be able to control the expectation about argument number through the keyword, without changing the option name, but I understand if the other way (as implemented) is preferred. Can you clarify, though, or direct me in the docs, the distinction in the number expectation between "one or more" vs. "two or more?" What does it mean for "two or more" to be expected (for nargs='*') if there's no parse error thrown even when the option's entirely omitted?