Implement myBind (Function.prototype.bind)

Implement myBind(fn, thisArg, ...boundArgs)

The interview classic. Write myBind(fn, thisArg, ...boundArgs) that returns a new function which, when called:

1. Invokes fn with this bound to thisArg.
2. Prepends boundArgs before whatever arguments the new function is called with (partial application).
3. New-safety: if the bound function is itself called with new, the preset thisArg must be ignored, a fresh object should be constructed as normal, and it must still be an instanceof the original fn.

function add(a, b, c) { return a + b + c; }
const add5 = myBind(add, null, 5);
add5(1, 2); // 8
 
function Point(x, y) { this.x = x; this.y = y; }
const BoundPoint = myBind(Point, { x: 999 });
new BoundPoint(3, 4).x; // 3, the preset thisArg was ignored