number_proxy_range.js

Number.prototype.to = function*(n) {
  let finish = n.valueOf();
  let start = this.valueOf();
  let finishLessThan = start >= finish;
  for (
    let i = start;
    finishLessThan ? i >= finish: i <= finish;
    i += finishLessThan ? -1 : +1
  ) yield i;
};

Object.setPrototypeOf(Number.prototype, new Proxy({}, {
    get: (_, finish, start) => start.to(finish)
})); 

// Loop from 20 to 200
for (let n of 20[200]) {}

// Loop from -1000 to 0 (Neg must be wrapped in paren)
for (let n of (-1000)[0]) {}