snippet stolen from isaacs on irc

gistfile1.js

Object.setPrototypeOf = function (obj, newProto) { 
  var n = Object.create(newProto); 
  Object.getOwnPropertyNames(obj).forEach(function (name) { 
    Object.defineProperty(n, name, Object.getOwnPropertyDescriptor(obj, name)) 
  }); 
  return n 
}