public static RotationalStiffness DecanewtonMillimetersPerRadian <T>(this T value) =>
 RotationalStiffness.FromDecanewtonMillimetersPerRadian(Convert.ToDecimal(value));
 public void NumberToDecanewtonMillimetersPerRadianTest() =>
 Assert.Equal(RotationalStiffness.FromDecanewtonMillimetersPerRadian(2), 2.DecanewtonMillimetersPerRadian());