public static RotationalStiffness KilonewtonMillimetersPerDegree <T>(this T value) =>
 RotationalStiffness.FromKilonewtonMillimetersPerDegree(Convert.ToDecimal(value));
 public void NumberToKilonewtonMillimetersPerDegreeTest() =>
 Assert.Equal(RotationalStiffness.FromKilonewtonMillimetersPerDegree(2), 2.KilonewtonMillimetersPerDegree());