public static RotationalStiffness MeganewtonMillimetersPerRadian <T>(this T value) =>
 RotationalStiffness.FromMeganewtonMillimetersPerRadian(Convert.ToDecimal(value));
 public void NumberToMeganewtonMillimetersPerRadianTest() =>
 Assert.Equal(RotationalStiffness.FromMeganewtonMillimetersPerRadian(2), 2.MeganewtonMillimetersPerRadian());