code: func (g *BuilderGroup) Nodes() []*BuilderNode {
  	nodes := []*BuilderNode{}
  	for node, group := range g.builder.ring.NodeToGroup {
  		if group == g.index {
  			nodes = append(nodes, g.builder.nodes[node])
  		}
  	}
  	return nodes
  }
docs: // Nodes returns the slice of nodes within this group and all its child groups.