title: Data attribute becomes integer
body: <p>Check out this simple example <a href="http://jsfiddle.net/TZxUU/2/" rel="noreferrer">on jsfiddle</a></p>
  
  <pre><code>&lt;div id ="a" data-siteid="00005"&gt;00005 turns into:&lt;/div&gt;
  &lt;div id="b" data-siteid="S00005"&gt;S00005 turns into: &lt;/div&gt;
  </code></pre>
  
  <p>code</p>
  
  <pre><code>$('#a').append($('#a').data("siteid"));
  $('#b').append($('#b').data("siteid"));
  </code></pre>
  
  <p>​
  result</p>
  
  <pre><code>00005 turns into:5
  S00005 turns into: S00005
  </code></pre>
  
  <p>I would like to return "00005" and "S00005".</p>