Number Range Validation

I have a floating point number that I want to validate is between -90 and 90, I created a rule in the Field Validation window (for this field “initialLatitude”):

Number Range(-90 < initialLatitude < 90)

The error that I receive in Content Explorer (after I submit the form with a value of 80.1 for initalLatitude) is:

java.lang.RuntimeException: The value of default for param at ‘0’ is not a numeric value.

Does Number Range not work with floats? If I submit 80 for the value of initalLatitude Rhythmyx doesn’t error.