title: NSJSONSerialization parses JSON, boolean and number values are null
body: <p>I use NSJSONSerialization to call a login url which returns a JSON object. This obj has 3 props: <strong><em>data</em></strong> is obj, <strong><em>success</em></strong> is boolean(NOT String, indicates login success or not), <strong><em>timeout</em></strong> is number(NOT String).
  The problem is the <strong><em>success</em></strong> and <strong><em>timeout</em></strong>'s values are null. The data is fine.
  I tested this url from html file requiring, it works fine.
  What's the problem?</p>
  
  <p><a href="http://screencast.com/t/chDMshKPl" rel="nofollow">http://screencast.com/t/chDMshKPl</a></p>