unsetting non existent variables

[Dan Jacobson]

$ man bash
       unset [-fv] [name ...]
            ...  The exit status is true unless a name does not exist or is 
readonly.

$ set|grep mmm
$ unset mmm; echo $?
0

mmm didn't exist, but the exit status was still true.

Actually, I'd rather you change the man page so that unsetting non
existent variables is not an error, else many of my bash -e scripts
will fail.

BTW,
$ help unset
doesn't mention exit status.