Once again, please forgive my ignorance, but this section of code 
(https://github.com/mootools/mootools-core/blob/master/Source/Element/Element.Event.js#L148)
 
would seem to indicate to me that the mouseenter event could 1) very well 
be a native element or 2) not require a parent lookup unless e.related is 
null or undefined. I guess it would depend on the markup involved, but I 
can't imagine this would bring the browser to its knees. There must be 
something obvious I am overlooking here...

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