The same way you count time on a clock. The same way the Romans and Greeks did it thousands of years ago. And they had no concept of zero.
But as you inferred, it is not necessary for WeatherFlow to change it. I already change it in my code. I probably never would have given it a second thought except I had an ATC ask me why north was reading 0 degrees.
You don’t. Compass directions are integer values. Even in super accurate GPS terms.