Comment 14 for bug 20796

(In reply to comment #13)
> Yes, I thought we had learned our lesson with this already. odd-numbered
> releases are proper releases, while even-numbered ones are development
> snapshots, or something of that nature?

Almost:

"Stable versions can be identified by the last digit of the version number
being a 0 (zero). All other releases are development snapshots."

according to http://ipw2200.sourceforge.net/