Oh shit. That's not a bad idea. My thought process is thus:
1.2.2.2
First digit (1) = the last season that I consider fully complete
Second digit (2) = the last episode that I consider fully complete in the new season
Third digit (2) = the approximate progress (main + side content) toward the finishing of the next episode
Last digit/two digits (2/20) = the most recent bugfix version