[#12096] - String for Domain Axis Range parameters?!

In chart customizer "Domain Axis Range and Tick" for XYChart, I'm trying to pass on the input from methods of a parameter (which is Enum in my case). One would expect that the input should be numeric or some sort of enum, perhaps. But no - String is expected! Or else I get cast errors attempting to cast Integer to String.

I think this is counter-intuitive at best.