public static RotationalStiffness NanonewtonMillimetersPerRadian <T>(this T value) =>
 RotationalStiffness.FromNanonewtonMillimetersPerRadian(Convert.ToDecimal(value));
 public void NumberToNanonewtonMillimetersPerRadianTest() =>
 Assert.Equal(RotationalStiffness.FromNanonewtonMillimetersPerRadian(2), 2.NanonewtonMillimetersPerRadian());