ifupdown missing DHCPv6 support

I've been corresponding with the Debian maintainer on this, and have just sent a patch for this to the Debian bug tracking system:

  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=632915

This bug was fixed in the package ifupdown - 0.7~alpha5.1ubuntu1

---------------
ifupdown (0.7~alpha5.1ubuntu1) oneiric; urgency=low

  * Resynchronise with Debian experimental. Remaining changes:
    - ifupdown.nw: Use 100 as default route metric unless an explicit metric
      parameter is set in /etc/network/interface.
    - ifupdown.nw: Add 'ipv4ll' method which uses avahi-autoipd to bring up
      an interface with an IPv4 link-layer address from 169.254.0.0/16 (aka
      'Zeroconf').
    - Add iniparser3.0b sources (dictionary.c, dictionary.h, iniparser.c,
      iniparser.h), to let ifupdown avoid auto-up/down of interfaces if
      network-manager's ifupdown plugin is in managed=true mode.
    - Add a new query interface, 'ifquery', that can be used by upstart
      hooks to ask for the list of possible interfaces that they might need
      to bring up.
    - debian/ifupdown.network-interface.upstart: Replace the init scripts
      with a per-interface Upstart job.
    - debian/ifupdown.networking.upstart: Add a "networking" job that
      partially replaces the networking init script from netbase.
    - debian/control: Bump build-dependency on debhelper for Upstart-aware
      dh_installinit.
    - debian/rules: Due to debhelper always adding /etc/init.d symlinks, we
      must manually remove /etc/init.d/networking for as long as netbase
      still provides it.
    - Add if-up and if-down scripts to emit Upstart events when interfaces
      come up and go down.
    - debian/ifupdown.network-interface-security.upstart: Ensure apport is
      started before interfaces are brought up by either ifupdown or
      network-manager.
    - debian/postinst: If the loopback interface is missing from the config
      in /etc/network/interfaces, add it on upgrade.
    - debian/ifupdown.preinst: Since files in /etc were not conffiles in
      lucid, and /etc/network/if-up.d/upstart and
      /etc/init/network-interface.conf changed between lucid final and
      maverick, add extra handling to avoid spurious conffile prompts.
  * Backport from upstream Mercurial repository:
    - Add initial DHCPv6 support (LP: #733547).

ifupdown (0.7~alpha5.1) experimental; urgency=low

  * Non-maintainer upload.
  * No source changes.
  * Upload to experimental rather than unstable.

ifupdown (0.7~alpha5) experimental; urgency=low

  * Set PHASE variable (Closes: #629821).
  * Allow privacy extensions for inet6/auto (Closes: #629841).
  * Make Router Advertisements and SLAAC configurable (Closes: #629837).
  * Fix the IPv4 interface down sequence (Closes: #629836).
  * Add Vcs-* fields.
  * Remove privacy extensions option for 6in4/6to4 interfaces
    as no SLAAC is possible there.
  * Document interface exclusion option.
  * Improve conversions code, allowing calculating 6to4 address without
    calling external utilities.
  * Fix some compilation warnings.
  * Update test cases.

ifupdown (0.7~alpha4) experimental; urgency=low

  * New maintainer.
  * Remove VCS repository from the tarball (Closes: #417718).
  * Add source stanza (Closes: #159884, #149395, #471834).
  * Fix bashism in example script get-mac-address.sh (Closes: #518924).
  * Use DebSrc3.0 so...