From my reading of the docs, Automerge will arbitrarily pick a "winning" document in the case of a conflict, but guarantees that the same winner will be chosen if the merge were to occur, for instance, in a different order:

    // Pretend doc1 and doc2 are already Automerge objects
    let doc1 = { x: 1 }
    let doc2 = { x: 2 }

    // x will be either 1 or 2 (arbitrarily chosen), but
    // res1 will always == res2 regardless of choice
    let res1 = Automerge.merge(doc1, doc2)
    let res2 = Automerge.merge(doc2, doc1)
    
    res1 == res2 // true

However, there may be cases where you want to manually resolve conflicts, and if that is the case, the `_conflicts` property is there so that you can undo whatever merge occurred automatically and set the "winner" yourself.