Bug: 1.3_b1 selector [nodeType=3] not working

This html:
<body>
<div id="demo">Lorem ipsum dolor sit amet.</div>
</body>
This jQuery:
$(document).ready(function(){
alert($('#demo').contents().filter('[nodeType = 3]').length);
alert($('#demo').contents().filter('[nodeType=3]').length);
});
both alerts are 1 in 1.2.6, 0 in 1.3_b1
Thanks, Marion