Option full name (long-form).
Sets option abbrevation (short-form).
Sets option abbrevation (short-form).
Sets option abbrevation (short-form).
Sets option full name (long-form).
Option full name (long-form).
Sets entry name.
Entry name.
Display name for entry.
Sets entry help description (one-liner).
Entry help description (one-liner).
Sets whenever entry can be repeated.
Gets whenever entry can be repeated.
Sets entry required flag.
Sets entry optional flag.
Whenever entry is required.
Sets entry default value.
Sets entry default value array.
Entry default value array.
Adds entry validator.
Entry validators.
Option interface.
Used by flags and options, which both contain short and long names. Either can be null but not both.