public static RotationalStiffness KilonewtonMillimetersPerRadian <T>(this T value) =>
 RotationalStiffness.FromKilonewtonMillimetersPerRadian(Convert.ToDecimal(value));
 public void NumberToKilonewtonMillimetersPerRadianTest() =>
 Assert.Equal(RotationalStiffness.FromKilonewtonMillimetersPerRadian(2), 2.KilonewtonMillimetersPerRadian());