blend feature: width constant ratio: attached variable is rounded to nearest whole number

Hi

Having problems with attaching or assigning a variable to the ratio on the width constant tool. It rounds the number to the nearest whole number.

example: If the variable is say R = 0.8567 it will round up to 1.0000

Not sure why it does this because if i enter the number manually it works but when its a assigned a global variable it rounds it.

Any feedback would be great.

Josh