public static RotationalStiffness DecinewtonMillimetersPerRadian <T>(this T value) =>
 RotationalStiffness.FromDecinewtonMillimetersPerRadian(Convert.ToDecimal(value));
 public void NumberToDecinewtonMillimetersPerRadianTest() =>
 Assert.Equal(RotationalStiffness.FromDecinewtonMillimetersPerRadian(2), 2.DecinewtonMillimetersPerRadian());