/**
  * {@inheritdoc}
  */
 protected function normalizeAttributes(FamilyInterface $family, array $context = [])
 {
     $attributes = parent::normalizeAttributes($family);
     return implode(',', $attributes);
 }
 /**
  * {@inheritdoc}
  */
 protected function normalizeAttributes(Family $family)
 {
     $attributes = parent::normalizeAttributes($family);
     return implode(',', $attributes);
 }