Typing for callable inputs in itertools.starmap

The type annotations for itertools.starmap allow any iterables for any function arguments:
https://github.com/python/typeshed/blob/11c7821a79a8ab7e1982f3ab506db16f1c4a22a9/stdlib/itertools.pyi#L112-L116

This means I can do something like:

def myfunc(x: int, y: int):
    return x + y

itertools.starmap(myfunc, [["foo, "bar"]])

and type checkers won't complain.

map gets around this to some extent with overloads for callables with up to 5 arguments (but if you need 6 or more, you're out of luck!)
https://github.com/python/typeshed/blob/11c7821a79a8ab7e1982f3ab506db16f1c4a22a9/stdlib/builtins.pyi#L1629-L1670

I couldn't figure out a way to ge that to work with starmap, though, because as far as I can tell the python type system doesn't have any way of specifying an iterable that returns a particular sequence of types. The best you can do is something like def __new__(cls, function: Callable[[_T1, _T2], T], iterable: Iterable[Iterable[_T1 | _T2]], /), which is still better in my opinion (it prevents invalid argument types), but it doesn't stop you from swapping function arguments.

Is there a way to do this? Or does it just need a new language feature? It would be great if we could do something like

P = ParamSpec("P")
def __new__(cls, function: Callable[P, T], iterable: Iterable[P.args], /)

首先阅读 stdlib/itertools.pyi 中第 112-116 行附近的 itertools.starmap 注解，然后将其与 stdlib/builtins.pyi 中第 1629-1670 行附近 map 的 callable 重载进行比较。确定当前 Python 类型系统是否能够表达所请求的 callable 与输入之间的关系，并定义正确的注解应保证什么。