public UnitDefinition_ThisIsNThat(string sn, string pn, double n, UnitDefinition u, params string[] a) : this(sn, pn, n, u, (IEnumerable <string>)a)
{
}
public UnitDefinition_ThisIsNThat(string sn, string pn, double n, UnitDefinition u, IEnumerable <string> a) : base(sn, pn, a)
{
multiplier = n;
unit_definition = u;
}