File resource fails for root(/) directory.

I know this is probably an extreme edge case, but I recently noticed that this fails:

file { '/': ensure => directory }

with the error:  Parameter path failed: File paths must be fully qualified, not '' at /tmp/test.pp:1

A little background, This comes from a larger module that I have which uses the lvm module to create additional or grow existing filesystems on a server. The file resource is used to make sure the mount point exists before using the mount resource to manage /etc/fstab and mount the filesystem. I noticed that if I tried to use my custom module to grow the root(/) filesystem that I got the error above. Is the / being removed to make it an empty path as a result of some code to try and remove trailing slashes from paths?