code: function (log, seq, cb) {
      dag.logs.get(log, seq, function (err, entry) {
        if (err && err.notFound) return cb()
        if (err) return cb(err)
        if (entry.change > changes) return cb() // ensure snapshot
  
        entry.log = log
        entry.seq = seq
  
        var i = 0
        var loop = function () {
          if (i < entry.links.length) return sendHave(entry.links[i++], loop)
          entry.links = noarr // premature opt: less mem yo
          outgoing.push(entry, cb)
        }
  
        loop()
      })
    }
docs: Send a specific entry in a specific log to the other side. If the node links to other nodes, inform the other side we have those, too.