At the moment only the changed property that has triggered a diff property reaction is passed to the function when it is executed. This is pretty restrictive so it would be much more flexible if all the previous and current properties were passed to each reaction.
Enhancement
At the moment only the changed property that has triggered a diff property reaction is passed to the function when it is executed. This is pretty restrictive so it would be much more flexible if all the previous and current properties were passed to each reaction.