public static RotationalStiffness MillinewtonMillimetersPerRadian <T>(this T value) =>
 RotationalStiffness.FromMillinewtonMillimetersPerRadian(Convert.ToDecimal(value));
 public void NumberToMillinewtonMillimetersPerRadianTest() =>
 Assert.Equal(RotationalStiffness.FromMillinewtonMillimetersPerRadian(2), 2.MillinewtonMillimetersPerRadian());