check this fiddle:

http://jsfiddle.net/8VMQs/1/

basically, i'd expect when doing element.set('checked', true); the change event bound NOT to fire automatically.
observed: event fires.

i am trying to find a way to differentiate the event from a UI driven event (eg, one that is a result of a click) but there is nothing in it, it's just propertychange bubbling to change.

relevant bit: https://github.com/mootools/mootools-core/blob/master/Source/Element/Element.Event.js#L170-183

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