public static RotationalStiffness DecinewtonMillimetersPerDegree <T>(this T value) =>
 RotationalStiffness.FromDecinewtonMillimetersPerDegree(Convert.ToDecimal(value));
 public void NumberToDecinewtonMillimetersPerDegreeTest() =>
 Assert.Equal(RotationalStiffness.FromDecinewtonMillimetersPerDegree(2), 2.DecinewtonMillimetersPerDegree());