OPT_NUM
OPT_NUM(letter, name, field, 0, 1, desc)
OPT_NUM('l', "isolevel", isoLevel,
OPT_NUM('v', "verbose", verbose_level,
OPT_NUM(letter, name, field, 0, 1, desc)
OPT_NUM('t', "tz", gmtoff, -24, 24, "timezone"),
OPT_NUM('p', "metaperc", meta_perc, 1, 99,