[p3lim]

For reference, the default [level] tag:
https://github.com/oUF-wow/oUF/blob/....lua#L221-L232

['level'] = [[function(u)
    local l = UnitLevel(u)
    if(UnitIsWildBattlePet(u) or UnitIsBattlePetCompanion(u)) then
        l = UnitBattlePetLevel(u)
    end
    if(l > 0) then
        return l
    else
        return '??'
    end
end]],