anchor.diff:  type External {
     auctionHouses(size: Int, term: String): [ExternalAuctionHouse!]!
     fairs(size: Int, term: String): [ExternalFair!]!
  -  galleries(size: Int, term: String): [ExternalGallery!]!
  +  galleries(
  +    # Limit results to only galleries on Artsy
  +    artsyOnly: Boolean = true
  +    size: Int
  +    term: String
  +  ): [ExternalGallery!]!
   }
   
   type ExternalAuctionHouse {
     city: String
     country: String
  -  id: Int!
  +
  +  # A globally unique ID.
  +  id: ID!
  +
  +  # A type-specific ID.
  +  internalID: ID!
     name: String!
   }
   
  
positive.code: 
  type ExternalGallery {
    city: String
    id: Int!
    name: String!
    partner: Partner
    region: String
  
negative.code:     # https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
      timezone: String
    ): String
  
    # A globally unique ID.
    id: ID!
  
    # A type-specific ID.
    internalID: ID!
    name: String!
    startAt(
      format: String
  