Generic ParamSpec in subclass definitions

Given some base class that is generic over a param-spec, I'd like to be able to define the param-spec using a subclass method implementation. Something like:

T = TypeVar("T")
P = ParamSpec("P")

class Base(Generic[P, T]):
    func: Callable[P, T]
    # for instance
    def wrapper(self, *args: P.args, **kwargs: P.kwargs) -> Tuple[T]:
        return (self.func(*args, **kwargs), )
        
class Subclass(Base):
    def func(self, x: int, *, y: str) -> bytes: ...

That is, the base class is generic over some function definition, and the subclass implement that function as a method. I'm not sure how common this pattern is, but I see it a fair amount when the class gets more complicated and you can't just use a decorator (e.g. torch.nn.Module.forward is a big example of this). Is there some other way of specifying "infer the parameters from this method implementation"? Is this something that would require an update to the specification, is it "just" a feature request to the method implementation "like" an assignment statement?

ファイル、テスト、実装のエントリーポイントは指定されていません。まず、issue の ParamSpec、Generic、サブクラスメソッドの例を Python typing 仕様と併せて確認し、要求された推論がサポートされているのか、それとも仕様の変更が必要なのかを判断してください。動作とその実装範囲が明示的に決定されれば完了です。