Going to go out on a limb and say everything is set to
floor. At least for anything that is beneficiary to players.
Unless it is otherwise set so that it can't go below a certain amount. Such as below 0. (ie -1)
But that's just a guess. So even if it was 20.999 it would just be 20. untill you reached 21.0 or greater.
Many older mmo's do this from my knowledge. To help keep things 'balanced'. But I have no idea of p99's combat calculations and their use of int, double or float.