1.8 Tabs Spinner option isn't removed when content is loaded via Ajax

1.8 Tabs Spinner option isn't removed when content is loaded via Ajax

According to the docs for the spinner feature all that is required is a string with the content and a <span> element inside the <a> that contains the tab title. When testing this on jsbin the spinner text simply remains appended to the tab title, see example here:  http://jsbin.com/evulo3/4/