anchor.diff:    GOOGLE
   }
   
  +enum AuthenticationStatus {
  +  INVALID
  +  LOGGED_IN
  +  LOGGED_OUT
  +}
  +
   type AuthenticationType {
     # A globally unique ID.
     id: ID!
  
positive.code:     last: Int
    ): AuctionResultsByArtistsConnection
  
    # A list of cities
    cities(featured: Boolean = false): [City!]!
  
  
negative.code:     id: String!
    ): AuctionResult
  
    # If user is logged out; status is `LOGGED_OUT`. If user is logged in; status is
    # `LOGGED_IN`. If user is logged in with invalid authentication (401); 'Promise'
    # resolves to 'Status.Invalid'. All other status codes will resolve to
    # `LOGGED_IN` because we don't know whether or not the authentication is valid
    # (error could be something else).
    authenticationStatus: AuthenticationStatus!
  
    # A list of cities
    cities(featured: Boolean = false): [City!]!
  
  