protected function convertToScalarImpl(Aggregator $aggregator)
 {
     /* @var $aggregator NodeAggregator  */
     return ['own' => $this->aggregatorPresenter->convertToScalar($aggregator->getActualAggregator()), 'children' => array_map(function (Aggregator $childAggregator) {
         return $this->aggregatorPresenter->convertToScalar($childAggregator);
     }, $aggregator->getChildren())];
 }