Negative arguments should take the priority over numerical options

A negative argument can be mistaken for an option, for example with the options '1' and 'N' both having an argument, the following command line:

-N -123

will be interpreted as the option N with no argument, and the option 1 with 23 as argument. But the right interpretation is N=-123. The token -123 has been processed as a potential option first before being considered as the argument of the previous option.

This is consistent with JOpt Simple.