Does anyone know of a way to determine the number of decimal places of a numeric variable or of a way to return the correct number of decimals as a String?

I can't find a function to determine how many decimals are stored in the variable.

for example:

n = 20.000
? n            && returns 20.000
? TRANSFORM(n) && Returns 20

I'm feeling pretty stupid not be able to figure this one out.