public static RotationalStiffness NewtonMetersPerDegree <T>(this T value) =>
 RotationalStiffness.FromNewtonMetersPerDegree(Convert.ToDecimal(value));
 public void NumberToNewtonMetersPerDegreeTest() =>
 Assert.Equal(RotationalStiffness.FromNewtonMetersPerDegree(2), 2.NewtonMetersPerDegree());