code: func (n *BuilderNode) Partitions() []int {
  	n.builder.ring.FillReplicaToNodeToPartitions()
  	var partitions holdme.OrderedIntsNoDups
  	for _, nodeToPartitions := range n.builder.ring.ReplicaToNodeToPartitions {
  		for _, partition := range nodeToPartitions[n.index] {
  			partitions.Add(int(partition))
  		}
  	}
  	return partitions
  }
docs: // Partitions returns the list of partitions assigned to this node; the list
  // will be in ascending order with no duplicates.