anchor.diff:                  current_cmd_transport :: transport() | undefined,
                   async :: undefined | atom() | pid(),
                   parameters = [] :: [{Key :: binary(), Value :: binary()}],
  -                rows = [] :: [tuple()],
  +                rows = [] :: [tuple()] | information_redacted,
                   results = [],
                   sync_required :: boolean() | undefined,
                   txstatus :: byte() | undefined,  % $I | $T | $E,
  
positive.code: 
  code_change(_OldVsn, State, _Extra) ->
      {ok, State}.
  
  %% -- internal functions --
  
  
negative.code:          copy_send_rows/3,
           standby_status_update/3]).
  
  -export([handle_call/3, handle_cast/2, handle_info/2, format_status/2]).
  -export([init/1, code_change/3, terminate/2]).
  
  %% loop callback
  