preseed devfs notation doesn't work as advertised

Binary package hint: partman

the edgy preseed example says

# Alternatively, you can specify a disk to partition. The device name can
# be given in either devfs or traditional non-devfs format.
# For example, to use the first disk devfs knows of:
d-i partman-auto/disk string /dev/discs/disc0/disc

but that causes this dialog:
http://dev.personnelware.com/carl/temp/Oct11/a/edgypart.png

which basicaly says:
<ocr>
 Partition disks
This installer can guide you through partitioning a disk for use by
Ubuntu, or if you prefer, you can do it manually. If you do choose to use the guided partitioning tool, you will still haue a chance later to reuiew and customise the results.

Partitioning method :
Erase entire disk and use LVM: IDE1 master (hda) - 4.O GB VMware
Manually edit partition table
</ocr>

however, if I use
d-i partman-auto/disk string /dev/hda

It just does it.