Function identity

identity<T>(arg): T
Returns the passed argument. This function is a macro that compiles to just arg.

This is useful for ensuring that a value matches the given type in areas where it is not directly possible to do so.
Type Parameters
- T
Parameters
- arg: T
Returns T
Example
```
type P = { x: number, y: number };
const obj = {
  pos: identity<P>({ x: 5, y: 10 });
}
```