I'll second this wish to make the Number type more usable.
(One additional issue to improve Numbers is Issue2550559 (Pretty 
printing / formatting for Number types.))

One comment on using "," as separator. Please do not do this.
"." and "," are typical decimal delimiter characters. 
Roundup should be able to be localised in languages using ","
like in Germany in the user interface.
So it is not good to use it for range indications.