private static @NotNull AppendableStorageBackedByResizableMappedFile<int[]> openMapping(@NotNull Path dataFile, int size) throws IOException {
    return new AppendableStorageBackedByResizableMappedFile<>(dataFile,
                                                              size,
                                                              null,
                                                              IOUtil.MiB,
                                                              true,
                                                              IntPairInArrayKeyDescriptor.INSTANCE);
  }
private static @NotNull AppendableStorageBackedByResizableMappedFile<int[]> openMapping(@NotNull Path dataFile, int size)