code: public function removeExtraData(array $extraDataKeys = [])
      {
          foreach ($extraDataKeys as $key) {
              if (array_key_exists($key, $this->extraData)) {
                  unset($this->extraData[$key]);
              }
          }
      }
docs: Removes the passed extra data keys.
  
  @param array $extraDataKeys
  @return void