code: protected function createConfigurationDefinition()
      {
          $options = parent::createConfigurationDefinition()->getOptions();
  
          $operator = new FixerOptionBuilder('operator', 'The operator to use.');
          $options[] = $operator
              ->setAllowedValues(['=', ':'])
              ->setDefault('=')
              ->getOption()
          ;
  
          return new FixerConfigurationResolver($options);
      }
docs: {@inheritdoc}