anchor.diff:          array:set(Index, PrevCount - 1, Acc)
       end, Numpeers, Piecelist).
   
  +
   -spec increment(pieceset(), array()) -> array().
   increment(Pieceset, Numpeers) ->
       Piecelist = etorrent_pieceset:to_list(Pieceset),
  
positive.code:     NewState = State#state{
          subscriptions=NewSubscriptions},
      {reply, {ok, Ref, Piecelist}, NewState}.
  
  %% @private
  handle_cast(_, State) ->
  
negative.code:         IsMatching(SubPieceset)],
      [send_update(Sub, Numpeers) || Sub <- Matching],
      ok.
  
  
  -spec send_update(#subscription{}, array()) -> ok.
  send_update(Subscription, Numpeers) ->
  