Greets, I've been searching around and found various hints towards the third parameter of reduce-functions but I have not been able to find a description of when exactly it is invoked, and if it is possible to avoid your reduce function to be used in this way. It is also referred to as re-reduce sometimes? Would anyone be able to shed some light on this for, or point me to resources where I can learn more about this?
TIA, J. van der Plas
