title: why can not see the added property through Object.create() in console?
body: <pre><code>&lt;script&gt;
  var person = {
    kind: 'person'
  }
  
  var zack = Object.create(person, {age: {value:  13} });
  console.log(zack); 
  &lt;/script&gt;
  </code></pre>
  
  <p>Question:</p>
  
  <p>in firebug->console, it shows: Object { kind="person"}, why I can not see the added property: age?</p>