For now we use pouch/couch for this purpose, which does this (merge docs automatically and pick a winner) out of the box, but has the disadvantage of having to run couch which is an infrastructure pain. We have been exploring substituting it with crdt and this release seems to be the sign of maturity we needed to get us over the line.
I think you're misunderstanding how couch/pouch works.
It doesn't merge documents automatically - it deterministically picks a "winning" version of the data, but the winner is completely arbitrary. You need to look at the conflicting versions to properly resolve conflicts, otherwise you're pretty much just rolling a dice and saying "yeah that version of the data will do whatever". There's no actual merging going on.
