public static RotationalStiffness MicronewtonMillimetersPerRadian <T>(this T value) =>
 RotationalStiffness.FromMicronewtonMillimetersPerRadian(Convert.ToDecimal(value));
 public void NumberToMicronewtonMillimetersPerRadianTest() =>
 Assert.Equal(RotationalStiffness.FromMicronewtonMillimetersPerRadian(2), 2.MicronewtonMillimetersPerRadian());