The tilde operator is selecting the left-side element when I ''think'' it is only supposed to select the sibling elements following the one on the left side. For example, given this HTML:

<div>
  <div>one</div>
  <div id="test">two</div>
  <div>three</div>
</div>

The expression

 $("#test ~ div").text() 

returns "two three" instead of "three". Most people using this selector have an expression on the right side that doesn't match the left side, as does the jQuery test case, so the bug probably doesn't crop up often. This fix to jQuery.token also makes it a bit faster using Array.slice:

"~", function(a){
  var s = jQuery.sibling(a);
  return s.n > 0 ? s.slice(s.n+1) : [];
}