Parses a given parameter again and again until it fails.
Parses a given parameter again and again until it fails. Parses at least one.
Many parameters parse Set[A].
Many parameters parse Set[A]. This type converts that into a single A. If there is not a single A, the parameter fails.
Parses the remaining arguments as a single string.
Parses a given parameter again and again until it fails.
Parses a given parameter again and again until it fails. Parses at least zero.