general "toggle" command? general "toggle" prefix?

[Richard Stallman]

[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

There are many kinds of settings in Emacs, and for quite a few
we have implemented or considered commands to toggle
between recent settings.

Might it be useful to have a prefix for toggling a setting?
Might it be possible to write a general command that can toggle
various kinds of settings?



-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)