js: new is problematic

problem.js

function K() {
  this.za = "ze";
};

console.log(new K()); // => K { za: "ze" }

K.D = function() {
  this.la = "le";
};

console.log(new K.D()); // => K.D { la: "le" }
console.log(new K.D);   // => K.D { la: "le" }

K.C = function () {
  return function Y() {
    this.grr = true;
  };
};

console.log(new K.C);   // => function Y() { ... } whoops!
console.log(new K.C()); // => function Y() { ... } whoops!

// here's what we wanted
console.log(new (K.C())); // => Y { grr: true }