Sortable: Marginal event descriptions

[Klap-in]

When i was applying draggable and sortable i discover a difference between the ui.item that is given to the beforeStop and the receive event.

For both the api description is:
"The jQuery object representing the current dragged element."

http://api.jqueryui.com/sortable/#event-receive
http://api.jqueryui.com/sortable/#event-beforeStop

but when i modify ui.item in the receive callback the origin dragged item is modified, but not the dropped item. While i modify the ui.item in the beforeStop event the dropped item changes and not the origin (i my case the lastest was desired).

Is it possible to describe in the documentation bit more elaborated what the ui object is? or what the context is of the callback event.
With this information the differences between the events become more clear imho.