public override Variable Concat(Variable value) => new Variable(ToString() + value.ToString());
public override bool IsNotEqual(Variable value) => (Value.CompareTo(value.ToString()) != 0);
public override bool IsGreaterThanOrEqual(Variable value) => (Value.CompareTo(value.ToString()) >= 0);
public override bool IsLessThanOrEqual(Variable value) => (Value.CompareTo(value.ToString()) <= 0);