Sortables -- bad options do not fail gracefully, explode

Some sortable options do not fail gracefully/silently if passed an argument of the wrong type. For instance, the update option expects a function. If you pass a string by accident, it should fail gracefully but rather goes into an infinite loop of errors.

Infinite loop of errors

$("#list li").sortable({

update: 'oops its a string'

});

A simple conditional could stop this effect:

Pseudocode

if (typeof theargument != 'function') { // fail gracefully }

I've seen this with sortables, specifically the stop and update options, but I'm sure it's in other areas such as draggables also. While it does take human error to trigger it, human error should not make your browser explode.