Expanded class hierarchy of FieldItemNormalizer in Drupal 10
- class \Drupal\serialization\Normalizer\FieldItemNormalizer extends \Drupal\serialization\Normalizer\ComplexDataNormalizer implements \Symfony\Component\Serializer\Normalizer\DenormalizerInterface uses FieldableEntityNormalizerTrait, SerializedColumnNormalizerTrait