pygame.event.Event compatability with TypedDict

[sus-pe]

Description
Hi,
I'd like to be able to create my pygame.event.Event objects using TypedDicts
that specify the explicit form the event type should contain.
For example:

class PygameMouseMotion(TypedDict):
    pos: tuple[WindowX, WindowY]
    rel: tuple[int, int]
    buttons: tuple[LeftMouseBit, MiddleMouseBit, RightMouseBit]

@dataclass(frozen=True)
class MouseMotion:
    x: WindowX
    y: WindowY
    dx: int = 0
    dy: int = 0
    left: Bit = Bit.zero
    middle: Bit = Bit.zero
    right: Bit = Bit.zero

    def as_pygame(self) -> PygameMouseMotion:
        return PygameMouseMotion(
            pos=(self.x, self.y),
            rel=(self.dx, self.dy),
            buttons=(self.left, self.middle, self.right),
        )

async def test_mouse(game: Game) -> None:
    expected_mouse = MouseMotion.from_xy(x=0, y=0)
    pygame.event.post(
        pygame.event.Event(
            pygame.MOUSEMOTION,
            expected_mouse.as_pygame(),
        )
    )

    mouse = await game.wait_for_next_mouse_motion()
    assert mouse == expected_mouse

This snippet won't pass mypy:
tests\acceptance\mouse_test.py:12: error: Argument 2 to "Event" has incompatible type "PygameMouseMotion"; expected "dict[str, Any]" [arg-type]

If event.dict field had been type annotated with Mapping it would have worked fin.

Any thoughts?
Would this break anythong?

[aatle]

Unfortunately, the Event() constructor only accepts dict and its subclasses (TypedDicts are dicts at runtime), but not general Mappings (e.g. UserDict, MappingProxyType).
So it cannot be type annotated as Mapping (unless there was an implementation change).

Probably your best options right now are to either ditch the TypedDict completely (your small snippet doesn't seem to use PygameMouseMotion in a useful way), or have as_pygame() return a dict and then cast or type: ignore the return value.

[MightyJosip]

Also linking #2759