Idk if you're trying really hard to troll really badly, but:
Mathematically 0.1 and 0.10 and 0.100 an 0.1000 and so on are the same, but this is not mathematical - you're not supposed to calculate with these numbers...

It's usually just vX.Y.Z where X Y and Z are independent counting blocks and usually
X is 0 = unfinished, 1 = finished, 2 = first add-on, 3 = second add-on, etc.
Y is content upgrades on a smaller scale than a full add-on
Z is bugfixes
So v0.9 was the 9th and v0.10 the 10th content build of the unfinished game...
EDIT:
CookieMonster666 After a second read I kinda get your point, but I don't fully agree with it, as you can see...