Array of argument strings.

Used to describe arguments known to the parser.

Should an error be thrown when unknown arguments are encountered, or when arguments are passed that do not match the type configured in options.

Whether this command accepts positional arguments.

If true, allows explicitly setting boolean options to false by prefixing the option name with --no-.

Return the parsed tokens. This is useful for extending the built-in behavior, from adding additional checks through to reprocessing the tokens in different ways.