anchor.diff:  
     # Last four characters of the account identifier
     last4: String!
  +
  +  # Bank account type
  +  type: BankAccountTypes!
   }
   
   # A connection to a list of items.
  
positive.code: }
  
  union BankAccountMutationType = BankAccountMutationFailure | BankAccountMutationSuccess
  
  type Bidder implements Node {
    createdAt(
  
negative.code:   authentications: [AuthenticationType!]!
  
    # A list of the current user's bank accounts
    bankAccounts(
      after: String
      before: String
      first: Int
      last: Int
      type: BankAccountTypes
    ): BankAccountConnection
  
    # Returns a single bidder position
    bidderPosition(id: String!): BidderPositionResult
  