Symfony 6 serializer compatibility

[mitalcoi]

API Platform version(s) affected:2.6.8

Description
Trying to upgrade project to symfony 6, getting Compile Error:

" Fatal error: Declaration of ApiPlatform\Core\JsonLd\Serializer\ObjectNormalizer::normalize($object, $format = null, array $context = []) must be compatible with Symfony\Component\Serializer\Normalizer\NormalizerInterface::normalize(mixed $object, ?string $format = null, array $context = []): ArrayObject|array|string|int|float|bool|null in /Users/mitalcoi/development/phonedo_project/phonedo/vendor/api-platform/core/src/JsonLd/Serializer/ObjectNormalizer.php on line 65
"

The only way to temporary fix - is to update directly in vendor/ folder specific types:

[PierreRebeilleau]

What's your php version ? And Symfony\Component\Serializer\Normalizer\NormalizerInterface should look like this in vendor after update to sf6:

[chalasr]

The NormalizerInterface::normalize() return type declaration has been removed in symfony/serializer v6.0.1 so it looks like you installed v6.0.0. Try running composer update symfony/serializer --no-cache

[mitalcoi]

Upgrading to serializer v6.0.1 fixed issue, thx a lot!