1.8rc2 Toggle speed issue

I believe this was introduced in 1.8rc2. With Toggle, when specifying the (optional) Speed as a string (not a number), but the (optional) Options are NOT specified, the effect is showing but then quickly hiding the item being toggled.

Using the sample code at http://jqueryui.com/demos/toggle/ - the line under "run the effect"

Works:

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1. $("#effect").toggle(selectedEffect,options,500); default example

2. $("#effect").toggle(selectedEffect,500);

3. $("#effect").toggle(selectedEffect,{},"normal");

Does NOT work:

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1. $("#effect").toggle(selectedEffect,"normal");

2. $("#effect").toggle(selectedEffect,"slow");

Forum: http://forum.jquery.com/topic/1-8rc2-toggle-speed-issue

Test case: http://jsbin.com/uwozi/4