Improve tooltip for generic rest arguments in TypeScript

I'm not sure if this should be a feature request or a bug report.

The Issue

Here is a code sample the illustrates the issue (you will have to read this to understand the rest of the post):

// the outer function `fun` accepts a callback function
// the callback function accepts a set of generic parameters
// the outer function `fun` returns a function that accepts the same parameters as the callback
function fun<A extends any[]>(cb: (...args: A) => any) {
  return (...args: A) => {};
}

// create a callback function to pass to `fun`
function callback(foo: string, bar: number) { }

// call `fun` and pass in `callback` 
// The value returned by `fun` will be a function that accepts the same parameters as `callback`.
// myVar will be of type: (foo: string, bar: number) => void
const myVar = fun(callback); 

If you type in this code into VSCode and hover over myVar, you will see that everything works fine. The parameters are shown alongside their types:

However, if you try to call the function by typing myVar( , the tooltip doesn't provide the expected information:

What I would expect to see is:

myVar(foo: string, bar: number): void

What I actually see is:

myVar(...args: [string, number]): void

The primary issue with the way it's currently implemented is that you cannot see the parameter names when you are calling the function, instead you only see the parameter types.

[dragomirtitian]

Isn't this a duplicate of #26563?