denormalizers are no longer aliased as normalizer in 4.4

Start by reviewing commit d36c14c and the service IDs api_platform.jsonld.normalizer.item and api_platform.jsonld.denormalizer.item. Reproduce the issue with the DTO and decorator shown, then verify that decorating the normalizer also affects denormalization as it did in 4.3, without requiring a second decorator.

API Platform version(s) affected: 4.4.0

Description

Commit d36c14c splits normalizer and denormalizer into dedicated ItemNormalizer and ItemDenormalizer. This causes overwritten decorators to no longer work (docs is also still outdated https://api-platform.com/docs/v4.4/core/serialization/#decorating-a-serializer-and-adding-extra-data-for-symfony)

How to reproduce

Create a serializer that decorates only 'api_platform.jsonld.normalizer.item', it no longer decorates during denormalize.

// small DTO to play with:
class Test
{
    public bool $test = false;
}


#[AsDecorator('api_platform.jsonld.normalizer.item')]
class ExampleSerializer implements NormalizerInterface, DenormalizerInterface, SerializerAwareInterface
{
    public function __construct(
        #[AutowireDecorated]
        private readonly NormalizerInterface&DenormalizerInterface&SerializerAwareInterface $decorated,
    ) {
    }

    public function setSerializer(SerializerInterface $serializer): void
    {
        $this->decorated->setSerializer($serializer);
    }

    public function denormalize(mixed $data, string $type, ?string $format = null, array $context = []): mixed
    {
        $result = $this->decorated->denormalize($data, $type, $format, $context);
        $result->test = true;

        return $result;
    }

    public function supportsDenormalization(
        mixed $data,
        string $type,
        ?string $format = null,
        array $context = [],
    ): bool {
        return $this->decorated->supportsDenormalization($data, $type, $format, $context);
    }

    public function normalize(
        mixed $data,
        ?string $format = null,
        array $context = [],
    ): array|string|int|float|bool|ArrayObject|null {
        $result = $this->decorated->normalize($data, $format, $context);

       $result['extraProperty'] = true;
        return $result;
    }

    public function supportsNormalization(mixed $data, ?string $format = null, array $context = []): bool
    {
        return $this->decorated->supportsNormalization($data, $format, $context);
    }

    public function getSupportedTypes(?string $format): array
    {
        return $this->decorated->getSupportedTypes($format);
    }
}

Given this setup, I expect normalize to add extraProperty and denormalize to set test to true. In 4.3 this worked, in 4.4 it no longer works and we have to add an extra decorator:

~ #[AsDecorator('api_platform.jsonld.normalizer.item')]
+ #[AsDecorator('api_platform.jsonld.denormalizer.item')]
~ class ExampleSerializer implements NormalizerInterface, DenormalizerInterface, SerializerAwareInterface

Hence why this is a backwards compatibility break on a minor version (4.4).

Possible Solution
d36c14c should be removed from 4.4 and moved to 5.0

Additional Context