Allowing ordinal values on mounting

I'm using Ubuntu 13.04 dev with mount 2.20.1-5.1ubuntu6. On mounting a device like "mount /dev/sr0 '/media/sr 0'" /etc/mtab gets the following entry: /dev/sr0 /media/sr\0400 iso9660 ro 0 0
But if I'm trying to use the ordinal value 040 (space) on mounting I'm getting the following error:

root@ubuntu:~# mount /dev/sr0 '/media/sr\0400'
mount: mount point /media/sr\0400 does not exist

I think since mount uses ordinal values for /etc/mtab it should be able to understand ordinal values on mounting too.