[BUG?] git checkout $commit -- somedir doesn't drop files

Hello,

after these commands:

	$ git init
	$ mkdir subdir
	$ echo a > subdir/a
	$ git add subdir/a
	$ git commit -m a
	$ echo more a >> subdir/a
	$ echo b > subdir/b
	$ git add subdir/*
	$ git commit -m b
	$ git checkout HEAD^ -- subdir

I'd expect that subdir/b is removed from the index as this file didn't exist in HEAD^ but git-status only reports:

	# On branch master
	# Changes to be committed:
	#   (use "git reset HEAD <file>..." to unstage)
	#
	#	modified:   subdir/a
	#

Is this intended?

(I'm using git 1.8.4.rc3 as shipped by Debian (package version 1:1.8.4~rc3-1).)

Best regards Uwe