Hi, is it possible to type the props that `as` is required to accept? Without this it is easy to pass in an `as` prop that is not compatible with the polymorphic component. Thanks.

Using the heading example in the readme (also see [this codesandbox](https://codesandbox.io/s/polymorphic-types-required-props-for-as-y0bm8?file=/src/App.tsx) for a live reproduction):
```ts
// Heading from readme:
function Heading<
T extends React.ElementType = typeof HeadingDefaultElement
>({ as, color, style, ...restProps }: HeadingProps) {
const Element: React.ElementType = as || HeadingDefaultElement;
return ;
}

const MyHeading: React.FC<{}> = ({ children }) =>

{children}

function App() {
return (
<>

This should result in a type error because MyHeading doesn't accept a style prop,
but typescript thinks it's fine even though it doesn't work.

{/* this errors because MyHeading doesn't accept a style prop
MyHeading
*/}

);
}

```

Start with the Heading example in the README and the linked CodeSandbox reproduction. Check how HeadingProps derives props for the as component, then verify that passing a component without a style prop produces a TypeScript error while compatible components still type-check.

Written by the indexing model from the issue text.