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Chris, in both your sprintf solution and my "atoi/itoa", we need to add another workaround (like a route symbol) to get rid of the prepended "symbol" in case there is no space in the "string" stored in the coll.
I agree that adding a string datatype is a lot of work, but I'm sure it would be usefull.
Another trick, sligthly lighter, would be to use a umenu, with backslashes before the commas, to store and display the strings (soo much fun for a comma :-) :