code: protected function parseCommandArguments()
      {
          if ($this->argument('count')) {
              if (false === ($this->count = filter_var($this->argument('count'), FILTER_VALIDATE_INT, ['options' => ['min_range' => 1]]))) {
                  throw new \InvalidArgumentException('Count should be a positive integer.');
              }
          }
      }
docs: {@inheritdoc}