public static RotationalStiffness MeganewtonMillimetersPerDegree <T>(this T value) =>
 RotationalStiffness.FromMeganewtonMillimetersPerDegree(Convert.ToDecimal(value));
 public void NumberToMeganewtonMillimetersPerDegreeTest() =>
 Assert.Equal(RotationalStiffness.FromMeganewtonMillimetersPerDegree(2), 2.MeganewtonMillimetersPerDegree());