Update DenormalizerInterface::denormalize

[VincentLanglet]

Hi @ondrejmirtes

The stub from phpstan-symfony is restricting the return type to object|array, but there is no restriction in the interface from Symfony ; cf https://github.com/symfony/Serializer/blob/6.1/Normalizer/DenormalizerInterface.php.

So I changed the return type to mixed like the one from Symfony.

[ondrejmirtes]

The original stub was added here: https://github.com/phpstan/phpstan-symfony/pull/110/files#diff-d6e0c3f17a9176b0a39dd84f85be359c3c3040b510989168b8ada8c3dfd9e050R12

//cc @lucassabreu what do you think is correct here? Thank you.

[VincentLanglet]

For more context @lucassabreu, I have a friend returning other thing than object/array in this method, and everything working fine.
So since even the phpdoc from symfony is not restricting to object/array, I don't think we should here.

[lucassabreu]

@ondrejmirtes i think it makes sense to return mixed, Symfony kind of accepts scalar types, and there is no restriction by what I understand.

I think my logic at the time was that you didn't need a Denormalizer to convert mixed to scalars or resources, but I don't think it will make the stub less effective to allow mixed.

cc: @VincentLanglet

[ondrejmirtes]

Thank you.