ConstrainULong - Web APIs
candidate recommendation initial definition technically, constrainulong is actually based on an intermediary dictionary named constrainulongrange, which adds exact and ideal to ulongrange, with constrainulong being a type that can be either a long integer or a ulongrange.

ULongRange - Web APIs
the constrainulongrange dictionary is based on this, augmenting it to support exact and ideal values as well.