title: jQuery: .children()[index] not allow function invocation
body: <p>Why does this not work...   </p>
  
  <blockquote>
    <blockquote>
      <p>$('#parent').children()[3].html('Content');</p>
    </blockquote>
    
    <p><strong>Doesn't work</strong>
    TypeError: $("#parent").children()[3].html is not a function.</p>
  </blockquote>
  
  <p>when this does?</p>
  
  <blockquote>
    <blockquote>
      <p>var x = $('#parent').children()[3].className;</p>
    </blockquote>
    
    <p><strong>Does work</strong></p>
  </blockquote>
  
  <p>An example is found at my now-mashed <a href="http://jsperf.com/lastchild-vs-child-class" rel="nofollow">jsperf test</a></p>
  
  <p>Thanks.</p>