[jQuery] 1.3 and toggle()

[gmacgregor]

Consider this markup:

<div class="holder">
<h4>Foo</h4>
<div class="bar">
Hello!
</div>
</div>

Since upgrading to 1.3, this no longer works:

$('div.holder h4').click(function() {
        $(this).toggleClass('close');
        $(this).next('.bar').toggle("blind", {direction: "vertical"},
600);
        return false;
});

If I simply call $(this).next('.bar').toggle("fast") instead
everything is fine. Am I completely missing something in the docs with
regards to toggle()? Any help much appreciated...