anchor.diff:              case large_obj_partial_update(Key, HeadBin, IndexStart, HeadOffset, HeadSize) of
                   {error, Cause} ->
                       throw({error, Cause});
  -                _ -> nop
  +                _ ->
  +                    void
               end,
  +
               %% middle
               Rest3 = lists:foldl(
                         fun(Index, << MidBin:ChunkedObjLen/binary, Rest2/binary >>) ->
  
positive.code:                 {error, Cause3} ->
                      throw({error, Cause3});
                  _ ->
                      TailSize
              end
      end,
      NumChunks = erlang:max(IndexEnd, SrcMetadata#?METADATA.cnumber),
      %% https://github.com/leo-project/leofs/issues/596 revealed the below fix was wrong.
      %% - https://github.com/leo-project/leofs/issues/537
  
negative.code:                 {error, Cause} ->
                      throw({error, Cause});
                  _ ->
                      %% Offset + Size
                      void
              end;
          false ->
              %% head
  