It would be nice if the RequestPayloadValueResolver could optionally call the serializer->denormalize method regardless if $request->query, $request->request or $request->getContent() is empty.

Because if a DTO/request has optional arguments combined with some system-provided arguments, the data could be empty while the controller may still require this DTO class.

Also in cases where there are only required arguments, it is beneficial for the user to see which request arguments are needed. The PartialDenormalizationException may show this.

For example:

Where the $userId is provided by a custom normalizer that retrieves it from the Symfony Security User object. If $name isn't passed in the request, the class won't be constructed.

class GetUserQuery {
    __construct(private Uuid $userId, private ?string $name = null) {}
}