anchor.diff:      {ok, Ads} = lasp:query(?ADS_WITH_CONTRACTS),
       {ok, {_AdsId, AdsType, _AdsMetadata, AdsValue}} = lasp:read(?ADS_WITH_CONTRACTS, undefined),
   
  -    %% - If there are no ads (`sets:size(Ads) == 0') 
  +    %% - If there are no ads (`sets:size(Ads) == 0')
       %%   it might mean the experiment hasn't started or it has started
       %%   and all ads are disabled.
       %%   If `not lasp_type:is_bottom(AdsType, AdsValue)' then the experiment
  
positive.code:     %% Blocking threshold read for max advertisement impressions.
      MaxImpressions = lasp_config:get(max_impressions,
                                       ?MAX_IMPRESSIONS_DEFAULT),
      {ok, _Value} = lasp:read(CounterId, {value, MaxImpressions}),
  
      lager:info("Threshold for ~p reached; disabling!", [Ad]),
  
      %% Remove the advertisement.
      {ok, _} = lasp:update(?ADS, {rmv, Ad}, Actor),
  
      ok.
  
  
negative.code: log_message_queue_size(Method) ->
      {message_queue_len, MessageQueueLen} = process_info(self(), message_queue_len),
      lasp_logger:mailbox("MAILBOX " ++ Method ++ " message processed; messages remaining: ~p", [MessageQueueLen]).
  