A number in a unit, the unit carried in the type alone: at runtime it is the plain number it was made from. A number becomes a quantity only through a constructor such as mm or track, and a quantity in one unit cannot stand in for one in another.
mm
track
A number in a unit, the unit carried in the type alone: at runtime it is the plain number it was made from. A number becomes a quantity only through a constructor such as
mmortrack, and a quantity in one unit cannot stand in for one in another.