func StringsFromFlag(fs *flag.FlagSet, flagName string) []string {
	return []string(*fs.Lookup(flagName).Value.(*StringsValue))
}
func StringsFromFlag(fs *flag.FlagSet, flagName string) []string {
	return []string(*fs.Lookup(flagName).Value.(*StringsValue))
}
// StringsFromFlag returns a string slice from the flag.