owner=untrusted (uid=USER)
> del bar
bar: deleted
> get bar
bar: not found
> get nonexist
nonexist: not found
> del nonexist
nonexist: not found
> get foo
foo=fooval
> del foo
foo: deleted
> put baz bazval
> get baz
baz=bazval
> del baz
baz: deleted
> get baz
baz: not found
