should auto-remove obsolete conffiles?!

I have done do-release-upgrade of a default Hardy ubuntu server install + mdadm packakage, in two steps to precise (hardy->lucid->precise). My system is left with following obsolete conffiles:

 /etc/init.d/console-setup ce37d52b185b6ab6b1b55a1eed7df2cb obsolete
 /etc/apparmor.d/sbin.dhclient3 81f1039785395af461a9782401d763ce obsolete
 /etc/dhcp3/dhclient.conf 5e012287a1dcf058b3fea4c5bf0bd95a obsolete
 /etc/dhcp3/dhclient-enter-hooks.d/debug 23cdc0f2053ca58ee7ba5926af1296bc obsolete
 /etc/dhcp3/dhclient-exit-hooks.d/rfc3442-classless-routes 2b19910493f3865aaf46634ebdd0343e obsolete
 /etc/dhcp3/dhclient-exit-hooks.d/debug 34b179df34a6ac20dbb07542f33c8104 obsolete
 /etc/e2fsck.conf 71563145349a6c512471c495ad8d5143 obsolete
 /etc/magic.mime 272913026300e7ae9b5e2d51f138e674 obsolete
 /etc/magic 272913026300e7ae9b5e2d51f138e674 obsolete
 /etc/fuse.conf c9457cf5b2196da67d5ac816d1c86a4f obsolete
 /etc/udev/rules.d/85-ifupdown.rules 87c80c5291ac8e2415ef3f0369007859 obsolete
 /etc/udev/rules.d/65-mdadm.vol_id.rules dffd9fe51a41262c86b888499f6df92d obsolete
 /etc/event.d/control-alt-delete b9e5968d70426be30342405e78b10e43 obsolete
 /etc/event.d/sulogin 78c78501456cedf6dc0fd8e059394367 obsolete

The one in particular "65-mdadm.vol_id.rules" is causing bug 1127867 as well. Maybe do-release-upgrade should auto-remove obsolete conffiles, given that well we forget to do those and may not always get the right version dependency checks from Debian.