public decimal Round(decimal value, int decimalPlaces)
 => UpOrDown
     ? RoundingAdjusters.HalfUp(value, decimalPlaces)
     : RoundingAdjusters.HalfDown(value, decimalPlaces);
 public decimal Round(decimal value)
 => UpOrDown
     ? RoundingAdjusters.HalfUp(value)
     : RoundingAdjusters.HalfDown(value);