code: protected function getMetaOperator($method, ArgumentBag $args)
      {
          if ($not = $args->get('not')) {
              $args->set('not', false);
          }
  
          return ($not ^ $this->isWhereNull($method, $args)) ? '<' : '>=';
      }
docs: Determine the operator for count relation query.
  
  @param  string $method
  @param  \Sofa\Hookable\Contracts\ArgumentBag $args
  @return string