Correct props helper on discriminated/tagged union type

[wclr]

TS proposes all the props from intersection of the discriminated/tagged union type, but should be proposing on props of determined type.

interface Square {
  kind: "square";
  size: number;
}

interface Rectangle {
  kind: "rectangle";
  width: number;
  height: number;
}

interface Circle {
  kind: "circle";
  radius: number;
}

type Shape = Square | Rectangle | Circle;

let shape: Shape = {
  kind: "square",  
  // should propose only `size`
}

Ts 2.9.1