umask builtin

[kalle]

in my version 4.4.0(1),
`umask' gives me a numeric output of `0022',
while `umask -S' gives me an output of `u=rwx,g=rx,o=rx'.
Shouldn't umask -S also formulate the mask in a negative way, as does
`umask'? Thus giving out `u=,g=w,o=w'?

greetings,
kalle