bug in rm?

Hi,

I found that rm -i behaves strange.

I mount a FAT partition and do the following

#mount /dev/hda1 /mnt/dos
#ls
file
#rm -i file
rm: remove 'file'? sl
#ls
#

The file is removed when ansering sl (not removed on ls) and I checked out
man and info pages for rm -i and can't find 'sl', 's' or 'l' being a correct
verification answer to remove the file. All docs says 'y' and 'Y' is needed
to remove the file, or it is skipped.

OS: RedHat 7.1 default install

/Henrik