jQuery: iterate through each comment including comments in children

Using jQuery, how can I iterate through ALL comments, including comments that are inside child elements?

In this example, Comment 1 and Comment 4 are identified however Comment 2 and Comment 3 are missing because they are inside child elements.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Hello World</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.js" type="text/javascript"></script>
<script type="text/javascript">

$(document).ready(function () {
 var commentData = $('body').contents().filter(function(){return this.nodeType==8;});

 $.each(commentData, function( index, value ) {
  alert( this.nodeValue );
 });

});

</script>
</head>
<body>

<!-- Comment 1 -->
<div>
 <!-- Comment 2 -->
  <p>
   <!-- Comment 3 -->
  </p>
</div>
<!-- Comment 4 -->

</body>
</html>

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skijAsked:
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RobOwner (Aidellio)Commented:
like this: http://jsbin.com/carugip/1/edit?html,js,console,output

$(function() {
  $("*").contents().each(function(i,e){
    if (e.nodeType===8) {
      console.dir(e.data);
    }
  });
});

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