code: function onUpdate (update) {
        var value = update[0], ts = update[1], id = update[2]
        insertBatch (id, key, ts, JSON.stringify(value), scuttlebutt)
      }
docs: write the update twice, the first time, to store the document. maybe change scuttlebutt so that value is always a string? If i write a bunch of batches, will they come out in order? because I think updates are expected in order, or it will break.