code: final public function isReplay($replay = null)
      {
          if (null === $replay) {
              if (null === $this->isReplay) {
                  $this->isReplay = false;
              }
              return $this->isReplay;
          }
  
          if (null === $this->isReplay) {
              $this->isReplay = (bool) $replay;
              if ($this->isReplay) {
                  $this->freeze();
              }
              return $this->isReplay;
          }
  
          throw new LogicException('You can only set the replay mode on one time.');
      }
docs: {@inheritdoc}