At the basic concept, this should give correct results, and only lose the ability to do partial synchronization from the revisions that have been purged. (If you request a sync from before the history horizon, you just end up with a full sync, getting some documents that you already have.)
At the basic concept, this should give correct results, and only lose the ability to do partial synchronization from the revisions that have been purged. (If you request a sync from before the history horizon, you just end up with a full sync, getting some documents that you already have.)