apt-get build-dep -a $arch has wrong behavior for Build-Depends-Indep

Have just seen this wrong behavior with apt:

$ sudo apt-get build-dep -a armhf adduser
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  bzr-builddeb debhelper equivs gettext gettext-base intltool-debian lintian
  po-debconf po4a quilt
The following NEW packages will be installed:
  gcc-4.6-base:armhf gettext:armhf gettext-base:armhf libc6:armhf
  libcroco3:armhf libffi6:armhf libgcc1:armhf libgettextpo0:armhf
  libglib2.0-0:armhf libgomp1:armhf libncurses5:armhf libpcre3:armhf
  libselinux1:armhf libstdc++6:armhf libtinfo5:armhf libunistring0:armhf
  libxml2:armhf zlib1g:armhf
0 upgraded, 18 newly installed, 10 to remove and 0 not upgraded.
Need to get 7832 kB of archives.
After this operation, 8120 kB of additional disk space will be used.
Do you want to continue [Y/n]?

apt-get build-dep -a $arch appears to be incorrectly applying the cross-building rules to Build-Depends-Indep. We must install the Build-Depends-Indep for cross-building so that the 'build' target can be called, but since they're *indep*, we should always prefer the build-arch version.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: apt 0.8.16~exp12ubuntu6
ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
Uname: Linux 3.2.0-20-generic x86_64
ApportVersion: 1.95-0ubuntu1
Architecture: amd64
CheckboxSubmission: 017452a27eca3c8b498abbfa5ef91db9
CheckboxSystem: ecaaad6fa1e0799a0aa1126bf620f39e
Date: Thu Mar 29 20:15:01 2012
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: apt
UpgradeStatus: Upgraded to precise on 2011-11-08 (142 days ago)