It is not clear when this datatype should be used - what is the use case? the only thing I coudl think of is a reference range for lab tests with titer results, where you have a titer that is expected / normal and then titers that are abnormal and you want to declare both - like 1:4  is normal, anything above that up to 1:256 is abnormal. Is that what this is for? If do how would low number high number and denominator work?