grokking cl-callf

[Filipe Silva <filipe.silva@gmail.com>]

A few days ago Stefan Monier gave me an awesome tip about cl-callf:

this snippet:

(if display-line-numbers-current-absolute
(setq display-line-numbers-current-absolute nil)
(setq display-line-numbers-current-absolute t)))

is equivalent to this line:

(cl-callf not display-line-numbers-current-absolute)

So In the same spirit, I'm trying to write a function that toggles showing
line numbers:

to display line numbers:

(setq display-line-numbers 'visual)

to hide line numbers:

(setq display-line-numbers nil)

can I use cl-callf in this case to avoid writing the obvious if bounded
function?

thanks in advance.