code: private function parseVariadicParameter(
          &$i,
          &$results,
          $closure,
          &$closure_arguments,
          $prefix,
          $parameter
      ) {
          $i++;
          while (
              isset($this->argv[$i]) &&
              ($argument = $this->argv[$i]) != null &&
              ! $this->prefixExists($argument)
          ) {
              $closure_arguments[] = $argument;
              $i++;
          }
          $parameterClosure = $this->getParameterClosure($parameter);
          if ($parameterClosure->parent != null) {
              if (count($closure_arguments) > 0) {
                  $results[
                      $parameterClosure->parent->parameterName
                  ] = $closure(...$closure_arguments);
              } else {
                  $this->valid = false;
                  if ($this->errorHandler != null) {
                      $this->errorHandler->call(
                          $this,
                          $parameterClosure,
                          'Missing argument for parameter closure.'
                      );
                  }
              }
          } else {
              if (count($closure_arguments) > 0) {
                  $results[
                      substr(
                          $parameter,
                          strlen($prefix),
                          strlen($parameter) - strlen($prefix)
                      )
                  ] = $closure(...$closure_arguments);
              } else {
                  $this->valid = false;
                  if ($this->errorHandler != null) {
                      $this->errorHandler->call(
                          $this,
                          $parameterClosure,
                          'Missing argument for parameter closure.'
                      );
                  }
              }
          }
      }
docs: Parse a parameter belonging to a prefix that has a variadic
  structure in it's closure definition and increment the
  parameter parser.
  
  @param  int                &$i
  @param  array              &$results
  @param  Closure            $closure
  @param  array              &$closure_arguments
  @param  string             $prefix
  @param  string             $parameter