• Fix version constraints for Doctrine MongoDB ODM
• Respect _api_respond request attribute in the SerializeListener
• Change the normalizer's priorities (< 0). If you have custom normalizer we recommend to use positive priorities.

Service name	Priority	Class
api_platform.hydra.normalizer.constraint_violation_list	-780	ApiPlatform\Core\Hydra\Serializer\ConstraintViolationListNormalizer
api_platform.jsonapi.normalizer.constraint_violation_list	-780	ApiPlatform\Core\JsonApi\Serializer\ConstraintViolationListNormalizer
api_platform.problem.normalizer.constraint_violation_list	-780	ApiPlatform\Core\Problem\Serializer\ConstraintViolationListNormalizer
api_platform.swagger.normalizer.api_gateway	-780	ApiPlatform\Core\Swagger\Serializer\ApiGatewayNormalizer
api_platform.hal.normalizer.collection	-790	ApiPlatform\Core\Hal\Serializer\CollectionNormalizer
api_platform.hydra.normalizer.collection_filters	-790	ApiPlatform\Core\Hydra\Serializer\CollectionFiltersNormalizer
api_platform.jsonapi.normalizer.collection	-790	ApiPlatform\Core\JsonApi\Serializer\CollectionNormalizer
api_platform.jsonapi.normalizer.error	-790	ApiPlatform\Core\JsonApi\Serializer\ErrorNormalizer
api_platform.hal.normalizer.entrypoint	-800	ApiPlatform\Core\Hal\Serializer\EntrypointNormalizer
api_platform.hydra.normalizer.documentation	-800	ApiPlatform\Core\Hydra\Serializer\DocumentationNormalizer
api_platform.hydra.normalizer.entrypoint	-800	ApiPlatform\Core\Hydra\Serializer\EntrypointNormalizer
api_platform.hydra.normalizer.error	-800	ApiPlatform\Core\Hydra\Serializer\ErrorNormalizer
api_platform.jsonapi.normalizer.entrypoint	-800	ApiPlatform\Core\JsonApi\Serializer\EntrypointNormalizer
api_platform.problem.normalizer.error	-810	ApiPlatform\Core\Problem\Serializer\ErrorNormalizer
serializer.normalizer.json_serializable	-900	Symfony\Component\Serializer\Normalizer\JsonSerializableNormalizer
serializer.normalizer.datetime	-910	Symfony\Component\Serializer\Normalizer\DateTimeNormalizer
serializer.normalizer.constraint_violation_list	-915	Symfony\Component\Serializer\Normalizer\ConstraintViolationListNormalizer
serializer.normalizer.dateinterval	-915	Symfony\Component\Serializer\Normalizer\DateIntervalNormalizer
serializer.normalizer.data_uri	-920	Symfony\Component\Serializer\Normalizer\DataUriNormalizer
api_platform.graphql.normalizer.item	-922	ApiPlatform\Core\GraphQl\Serializer\ItemNormalizer
api_platform.hal.normalizer.item	-922	ApiPlatform\Core\Hal\Serializer\ItemNormalizer
api_platform.jsonapi.normalizer.item	-922	ApiPlatform\Core\JsonApi\Serializer\ItemNormalizer
api_platform.jsonld.normalizer.item	-922	ApiPlatform\Core\JsonLd\Serializer\ItemNormalizer
api_platform.serializer.normalizer.item	-923	ApiPlatform\Core\Serializer\ItemNormalizer
serializer.normalizer.object	-1000	Symfony\Component\Serializer\Normalizer\ObjectNormalizer

• Allow custom stylesheets to be appended or replaced in the swagger UI
• Load messenger only if available
• Fix missing metadata cache pool for Elasticsearch
• Make use of the new AdvancedNameConverterInterface interface for name converters
• Refactor input/output attributes, where these attributes now take:
  • an array specifying a class and some specific attributes (name and iri if needed)
  • a string representing the class
  • a falsy boolean to disable the input/output
• Introduce the DataTransformer concept to transform an input/output from/to a resource
• Api Platform normalizer is not limited to Resources anymore (you can use DTO as relations and more...)
• MongoDB: allow a 0 limit in the pagination
• Fix support of a discriminator mapping in an entity