GraphQL intersection types?

schema.graphql

schema {
  query: Query
}

type Query {
  namespaces: AllNamespacesConnection
  users: AllUsersConnection
}

interface Node {
  id: ID!
}

interface Edge {
  cursor: String!
  node: Node!
}

interface Connection {
  edges: [Edge]!
  pageInfo: PageInfo!
}

type User implements Namespace, Node {
  id: ID!
  name: String!
}

type AllUsersEdge implements Edge {
  cursor: String!
  node: User!
}

type AllUsersConnection implements Connection {
  edges: [AllUsersEdge]!
  pageInfo: PageInfo!
}

interface Namespace {
  name: String!
}

# Right here is the problem. 
# How do we allow for a namespace edge?
# Intersection types maybe?
# `node` field values would need to implement both `Node` and `Namespace` to be valid
# https://github.com/facebook/graphql/issues/48
type AllNamespacesEdge implements Edge {
  cursor: String!
  node: (Node + Namespace)!
}

type AllNamespacesConnection implements Connection {
  edges: [AllNamespacesEdge]!
  pageInfo: PageInfo!
}