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