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Yeah, I'd like to know what is going on here. The new Efl.Canvas.Group_Object regular class inherits from Efl.Canvas.Group (which is now abstract), but nobody uses it, except Efl.Ui.Pager that uses it to retrieve... something? Help?
Efl.Ui.Pager uses it and the function evas_object_smart_add. Efl.Canvas.Group has to be abstract in order to support other abstract classes inheriting from it. However, since we have the case that we need it abstract and regular at the same time, I decided to have both, with the solution you see here.