anchor.diff:          true ->
               case From of
                   {server, undefined, {Address, Ref}} ->
  -                    gen_server:reply({Address, Ref}, {ok, {Id, Type, Value, Next}});
  +                    gen_server:reply({Address, Ref},
  +                                     {ok, {Id, Type, Value, Next}});
                   {fsm, undefined, Address} ->
  -                    gen_fsm:send_event(Address, {ok, undefined, {Id, Type, Value, Next}});
  +                    gen_fsm:send_event(Address,
  +                                       {ok, undefined,
  +                                        {Id, Type, Value, Next}});
                   _ ->
                       From ! Result
               end,
  
positive.code: 
  %% Internal functions.
  
  -spec internal_fold(store(), id(), function(), id(), fun(), function()) -> ok.
  internal_fold(Variables, Id, Function, AccId, BindFun, ReadFun) ->
      spawn_link(?MODULE, internal_fold_harness, [Variables,
                                                  Id,
                                                  Function,
                                                  AccId,
                                                  BindFun,
                                                  ReadFun,
                                                  undefined]),
      ok.
  
  -spec internal_fold_harness(store(), id(), function(), id(), function(),
                              function(), value()) -> function().
  internal_fold_harness(Variables, Id, Function, AccId, BindFun, ReadFun,
                        PreviousValue) ->
      %% Blocking threshold read on source value.
      {ok, {Id, Type, Value, _}} = ReadFun(Id,
                                           {strict, PreviousValue},
                                           Variables),
  
      %% @TODO: Generate a delta-CRDT; for now, we will use the entire
      %% object as the delta for simplicity.  Eventually, replace this
  
negative.code:                 {server, undefined, {Address, Ref}} ->
                      gen_server:reply({Address, Ref}, {ok, RThreshold});
                  {fsm, undefined, Address} ->
                      gen_fsm:send_event(Address,
                                         {ok, undefined, RThreshold});
                  _ ->
                      From ! Result
              end,
  