Hi, Turns out no need to change anything to compile under 10.2, but you do get a RTE if you directly call toJSON ("Variable JSON is not defined.") - that's probably OK given that no existing code would be calling it in 10.2 and someone using 10.2 is unlikely to directly call it and the minimum FP version for anything using JSON is likely to be at least 11.1.
Any other opinions? Thanks, Justin