Fatal error: Declaration of Drupal\default_content_extra\Normalizer\NodeEntityNormalizer::normalize($entity, $format = null, array $context = []) must be compatible with Drupal\hal\Normalizer\ContentEntityNormalizer::normalize($entity, $format = null, array $context = []): ArrayObject|array|string|int|float|bool|null
Fatal error: Declaration of Drupal\default_content_extra\Normalizer\NodeEntityNormalizer::denormalize($entity, $format = null, array $context = []) must be compatible with Drupal\hal\Normalizer\ContentEntityNormalizer::denormalize($entity, $format = null, array $context = []): mixed
1.0
Code
I have reviewed patch #4 → and tested functionality forking fine with Drupal 10.