anchor.diff:      Filter = riak_kv_coverage_filter:build_filter(ItemFilter),
       BufferMod = riak_kv_fold_buffer,
   
  -    Buffer = BufferMod:new(BufferSize, result_fun(Sender)),
  +    Buffer = riak_kv_fold_buffer:new(BufferSize, result_fun(Sender)),
       FoldFun = fold_fun(buckets, BufferMod, Filter, undefined),
       FinishFun = finish_fun(BufferMod, Sender),
       {ok, Capabilities} = Mod:capabilities(ModState),
  
positive.code:             FoldFun = fold_fun(keys, BufferMod, Filter, Extras),
              ModFun = fold_keys
      end,
      Buffer = BufferMod:new(BufferSize, BufferFun),
      FinishFun =
          fun(Buffer1) ->
                  riak_kv_fold_buffer:flush(Buffer1),
  
negative.code:                                     throw(index_reformat_client_died)
                              end
                          end,
                      Buffer = riak_kv_fold_buffer:new(BufferSize, ResultFun),
                      FoldFun = fun(B, K, Buf) -> BufferMod:add({B, K}, Buf) end,
                      FinishFun =
                          fun(FinalBuffer) ->
  