code: public function setKlass(string $className): void
      {
          if ($this->client->call('recur.update', $this->jid, 'klass', $className)) {
              parent::setKlass($className);
          }
      }
docs: {@inheritdoc}
  
  @param  string $className
  @return void
  
  @throws QlessException
  @throws RuntimeException