public static RotationalStiffness NewtonMillimetersPerDegree <T>(this T value) =>
 RotationalStiffness.FromNewtonMillimetersPerDegree(Convert.ToDecimal(value));
 public void NumberToNewtonMillimetersPerDegreeTest() =>
 Assert.Equal(RotationalStiffness.FromNewtonMillimetersPerDegree(2), 2.NewtonMillimetersPerDegree());