Use generics/template?

[CapitaineToinon]

Hey, I'm trying to validate api responses and all of them are wrapped in a data property like so

{
  "data": "..",
}

And I wanted to make a generic type for that but it doesn't seem to work.

/**
 * @template T
 */
class ResponseData extends Data
{
    /**
     * @param T $data
     */
    public function __construct(
      public $data
    ) {}
}

class CategoryData extends Data
{
    public function __construct(
        public string $id,
        public string $name,
    ) {}
}

class GameData extends Data
{
    /**
     * @param  ResponseData<array<CategoryData>>  $categories
     */
    public function __construct(
        public string $id,
        public ResponseData $categories,
    ) {}
}

ReponseData seems to just accept whatever I throw at it with this setup and doesn't convert my data property to a CategoryData object. I there a way to make this work?