code: function computeNodeBatchOp (node, done) {
        var batch = []
        var links = logLinks[node.key]
        addBatchAndDedupe(self, node, links, batch, opts, function (err, newNode) {
          if (err) return done(err)
          newNode.value = encoder.decode(newNode.value, opts.valueEncoding || self.valueEncoding)
          done(null, batch)
        })
      }
docs: Create a new leveldb batch operation for this node.