code: private List<Map<String, Result<R>>> handleRetcodeBatchingHack(List<Map<String, Result<R>>> list, Type xor) {
          return list.stream().map(m -> {
              return m.entrySet().stream().collect(Collectors.toMap(e -> e.getKey(), e -> {
                  return e.getValue().fold(err -> {
                      return err.<Result<R>>fold(
                              Result::error,
                              Result::error,
                              parsingError -> {
                                  if (parsingError.getJson().isJsonObject()) {
                                      JsonObject jsonObject = parsingError.getJson().getAsJsonObject();
                                      if (jsonObject.has("retcode")) {
                                          jsonObject.remove("retcode");
                                          return JsonParser.GSON.fromJson(jsonObject, xor);
                                      } else {
                                          return Result.error(parsingError);
                                      }
                                  } else {
                                      return Result.error(parsingError);
                                  }
                              },
                              Result::error
                      );
                  }, Result::success);
              }));
          }).collect(Collectors.toList());
      }
docs: specific to how a function is dispatched.