displayName and propTypes are not allowed on forwardRef component

## Description

Using displayName and propTypes on a forwardRef component shows error. I guess this is more of an issue with the example code than this library.

## Reproduction

https://codesandbox.io/s/typescript-as-prop-with-react-polymorphic-box-forked-hw0l5?file=/src/App.tsx

## Expected behavior

displayName and propTypes should be allowed.

## Actual behavior

displayName and propTypes are not allowed.

Reproduce the error in the linked CodeSandbox, then trace the TypeScript definitions used for the forwardRef component in this repository. Done means displayName and propTypes are accepted without errors while the existing polymorphic component typing behavior remains intact.

Written by the indexing model from the issue text.