title: jQuery .data() not retrieving data-*
body: <p>I'm testing with IE8.  I just upgraded jQuery from v1.5.2 to v1.6.1 and now the data method isn't working.</p>
  
  <p>the row look like this:</p>
  
  <pre><code>&lt;tr class="ui-widget-content alt" nodeIndex="2" data-DocAttributeFieldType="TextBox" data-DocClassAttributeFieldId="60777" jQuery16106588245076914028="66"&gt;
  </code></pre>
  
  <p>this works:</p>
  
  <pre><code>$("#docClassAttributeFields tbody tr:first").attr("data-DocClassAttributeFieldId");
  </code></pre>
  
  <p>this does not work:</p>
  
  <pre><code>$("#docClassAttributeFields tbody tr:first").data("DocClassAttributeFieldId");
  </code></pre>
  
  <p>Is there a bug in it?</p>
  
  <p>Here is an example.  Run it with in 1.5.2 and then 1.6 to see how they act differently...
  <a href="http://jsfiddle.net/5hbKX/">http://jsfiddle.net/5hbKX/</a></p>