code: func (g *BuilderGroup) AddNode(info string, capacity int) *BuilderNode {
  	return g.builder.AddNode(info, capacity, g)
  }
docs: // AddNode will create a new node in the associated builder with this group set
  // as the node's parent. Info is a user-defined string and is not used directly
  // by the builder. Capacity specifies, relative to other nodes, how many
  // assignments the node should have.