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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.devel
Subject: Re: Should mode commands be idempotent?
Date: Tue, 19 Sep 2017 23:09:17 -0400
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> Actually, I'm used to turning off minor modes by just calling their mode
> function a second time...

Of course, the well known and documented toggling behavior of minor
modes is not what he was referring to.

For a minor mode he was thinking of calling it twice with a positive arg
or twice with a negative arg.  


        Stefan