public static RotationalStiffness NanonewtonMetersPerDegree <T>(this T value) =>
 RotationalStiffness.FromNanonewtonMetersPerDegree(Convert.ToDecimal(value));
 public void NumberToNanonewtonMetersPerDegreeTest() =>
 Assert.Equal(RotationalStiffness.FromNanonewtonMetersPerDegree(2), 2.NanonewtonMetersPerDegree());