Attributes and skills are not stored as floats
The vanilla engine stores attributes and skills (but not level) as floats so if you do:
player->modstrength 0.4 player->modstrength 0.4 player->modstrength 0.4
your strength will be 1 higher in the stats screen (and if you do it 2 more times it'll be 2 higher). This is probably hardly if ever used by vanilla or mods but I was using it in my leveling mod until I realized it wasn't working.
(RM-4021 from redmine: created on 2017-08-14 by halbe null, )