anchor.diff:                                  anti_entropy_expire,
                                   ?DEFAULT_EXPIRE),
       %% Need to convert from millsec to microsec
  -    case Diff > (Expire * 1000) of
  +    case (Expire =/= never) andalso (Diff > (Expire * 1000)) of
           true ->
               clear_tree(State);
           false ->
  
positive.code: handle_call(destroy, _From, State) ->
      State2 = destroy_trees(State),
      {stop, normal, ok, State2};
  
  handle_call(_Request, _From, State) ->
      Reply = ok,
  
negative.code: -spec destroy(pid()) -> ok.
  destroy(Tree) ->
      gen_server:call(Tree, destroy, infinity).
  
  %% @doc Clear the specified index_hashtree, clearing all associated hashtrees
  clear(Tree) ->
      gen_server:call(Tree, clear, infinity).
  
  %%%===================================================================
  %%% gen_server callbacks
  