this external is a very basic expansion of an [until] object. It can be used in any case where you would normally go for [until] plus any kind of counter (i.e. looping through arrays in logical time).
You can set the number of steps via upper and lower limit and finally multiply the output by any constant allowing for some flexibility. All values can be negative as well. You can't accidentally go in an infinite loop either.
I included the source and the makefile for linux or os x users. It's compiled as *.dll on a windows system.
Hope anyone finds it useful.