/usr/share/doc/hfsutils/TODO is in hfsutils 3.2.6-13ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 1996-1998 Robert Leslie
$Id: TODO,v 1.14 1998/11/02 22:08:22 rob Exp $
===============================================================================
General to-do items (aka bugs):
  libhfs
  * support HFS+ (aka Sequoia, Extended Format)
  * don't allow reads from spared blocks
  * further improve efficiency of b*-tree searches?
  * concurrency considerations: opening same file multiple times;
      performing directory manipulations on open files
  * b*-tree record balancing?
  * smarter block allocation algorithm
  * volume full: hfs_write() should return bytes written < len, return -1
      on next call?
  * seek beyond end of file?
  * touch directory timestamps on file updates?
  * improve efficiency of bitmap operations
  * improve efficiency of search operations
  * CNID wrapping?
  * bad block sparing by physical block
  librsrc
  * determine resource sizes without reading them
  * support writability
  hfsck
  * modify libhfs to support low-level grubbing
  command-line tools
  * preserve timestamps (-p) for hcopy
  * recursive hcopy (-r)
  * allow hformat to create files and/or set size?
  * write Linux utilities mkfs.hfs, fsck.hfs
  * eliminate ftruncate()
  * more flags for hdel (-i, -r, -f)
  * glob :*:foo correctly
  * glob hcopy destination HFS path?
  * formalize hdisk.pl into the distribution
  xhfs
  * open arbitrary partitions
  * rename volumes
  * change file type/creator
  * more support for other platforms (correct device defaults; df output)
  * graphical partition map editor?
  * recursive copy: map illegal directory name chars
  copyin/copyout
  * finish/fix timestamp preservation
  * revisit buffer sizes
  * remember src/dst filenames (for preserve/delete)
  * allow name mangling to be optional
  * don't unconditionally clobber
  * delete incomplete files after failed transfers
  * AppleSingle, Netatalk-/CAP-style AppleDouble?
Future wish-list:
  * raw SCSI access for hideous platforms
  * partitioning utility
  * defragmenting utility
Acknowledged limitations:
  * null characters (ASCII 0x00) not supported in filenames
  * partition maps not managed with A/UX support
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