for var key in obj - keys out of order

gistfile1.js

var obj1 = {}

define(obj1, 'firstkey', {
  get: function() {
    return 'firstkey value'
  },
  enumerable: true
})

var Obj2 = function() {}

Obj2.prototype = obj1

var obj2 = new Obj2()

obj2.secondkey = 'should be last'

for(var k in obj2) {
  console.log('key:', k, obj2[k])
}