It may work with 1, and automatically default to bit 4, but I wouldn't rely on this for anything down the road. The correct arguments are 0 or 4. If they make some change to a library file down the road, and you have 1 VS 4, this may screw-the-pooch after an update.

I would opt for the correct arguments as shown in the manual just to be safe. I have seen stuff like this change with compiler updates, and it can end up being a real headache to debug.