collin/ShareJS — comment on commit 104c79095ebc6be3857f2566dbcd3b0377ebbb21
File: src/server/db/pg.coffee line 155
By josephg:

Its a bit of a hack that the version numbers aren't needed here. I did it to reduce storage space when I originally wrote the redis db backend - the version number was part of the key, so I saw no reason to also store the version number in the value.

They're re-added by the model code anyway, which is the only place db.getOps() is called.