fusermount: failed to open /dev/fuse: Permission denied

Bug description

fuse (sshfs, encfs, … ) fails reporting:

fusermount: failed to open /dev/fuse: Permission denied

This is because /dev/fuse is group root, when it should be group fuse
Workaround:

sudo chgrp fuse /dev/fuse

and all is well.

This is a perennial problem: Dapper, Edgy and now Feisty.