public override int GetHashCode()
        {
            var hashCode = 1146995530;

            hashCode = hashCode * -1521134295 + EqualityComparer <Option <object> > .Default.GetHashCode(LessThanValue);

            hashCode = hashCode * -1521134295 + LessThanOrEqualTo.GetHashCode();
            hashCode = hashCode * -1521134295 + EqualityComparer <Option <object> > .Default.GetHashCode(GreaterThanValue);

            hashCode = hashCode * -1521134295 + GreaterThanOrEqualTo.GetHashCode();
            return(hashCode);
        }