Define auxclick as a PointerEvent?

[RByers]

The PointerEvent spec will soon say that click should be a PointerEvent (in addition to being a MouseEvent). Should auxclick be defined from the start to be a PointerEvent?

My feeling here is that it probably shouldn't require it. Maybe for now just say that it's the same type as click? We should aim for this event to mature into the UI Events spec, and not all UI Events implementors will necessarily implement PointerEvents. So eventually this should just added to the list of events to upgrade in the PE spec. But during incubation it probably belongs here in some optional form.