Board Thread:Plants vs. Zombies 2: It's About Time/@comment-4546491-20140212222239/@comment-24275721-20140217012305

These assumptions are wrong. The version numbers don't represent decimals (even though they look like one). The 1.9 represents main version "1" with revision build ".9", with even more sub-versions. Any updates from v1.0 through v 1.9 represents revision of the previous version. If there's a v2.0. it represents the next increment in version history.

Also, @Plantshielder, the version number doesn't represent any chapter at all.