zfs-fuse file permissions problems on CentOS/RHEL 5

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http://serverfault.com – I'm testing zfs-fuse as an option to provide filesystem compression on existing CentOS 5 servers. I'm dealing with a highly-compressible dataset (80%), so zfs-fuse comes in quite handy. The issue I'm encountering with my storage pools is related to file permissions. It appears that zfs-fuse is ignoring or partially recognizing file permissions for non-owners. Assuming a zfs-fuse filesystem mounted at: /app/november comprised of files with permissions of 666 (-rw-rw-rw-) and owner "jack", I can read files and delete them as user "jill". However, I cannot write to those files or save them. Ev (HowTos)