Lua: addSkillLevelUpHandler does not work properly with skills that reached maximum level

Related code:

local function skillUsedHandler(skillid, params)
    if NPC.isWerewolf(self) then
        return false
    end

    local skillStat = NPC.stats.skills[skillid](self)
    skillStat.progress = skillStat.progress + params.skillGain / I.SkillProgression.getSkillProgressRequirement(skillid)

    if skillStat.progress >= 1 then
        I.SkillProgression.skillLevelUp(skillid, I.SkillProgression.SKILL_INCREASE_SOURCES.Usage)
    end
end

This code assumes that if progress is 1, it is a 100%, so there is a skill levelup.

The problem is that once skill reaches maximum level (100), progress continues to grow, but we do not reset it. As a result, at some point an every usage of this skill triggers a skill levelup event (because progress becomes > 1 and stays at this level forever).

I'd say that we should early out from skillUsedHandler if skill level reaches 100, but I am not sure if we support different skill caps at the moment.