anchor.diff:  %% @doc Get value from config file (cached)
   get(Key) ->
       gen_server:call(?MODULE, {get, Key}).
  +
  +%% @doc Get value from config file, returning default value when not set (cached)
  +get(Key, Default) ->
  +    case gen_server:call(?MODULE, {get, Key}) of
  +        undefined -> Default;
  +        Value -> Value
  +    end.
   
   %% @doc Set value in config file, update cache.
   set(Key, Value) ->
  
positive.code:             {noreply, State};
          _ -> 
              Config = write_config(Key, Value),
              {no_reply, State#state{config=Config}}
      end;
  
  %% @doc Trap unknown casts
  
negative.code: % API export
  -export([
      get/1,
      get/2,
      set/2,
      get_dirty/1,
      set_dirty/2
  