RE: global minor modes that can be overridden locally?[was:highlight-changes-mode]

[Drew Adams]

>     I think I disagree, if you mean that M-x foo-mode should
>     toggle locally. With that design:
>
>     . If there were no buffers where it was defined locally, then
>       M-x foo-mode would still toggle everywhere (global).
>
>     . If there were buffers where it was defined locally, then
>        M-x foo-mode would toggle differently, depending on where
>        it was invoked:
>
>       - toggle only locally, if invoked in a buffer with a local value
>       - toggle globally, if invoked in a buffer with no local value
>
> I never advocated anything where the same command sequence would
> sometimes be local and sometimes be global, so I think there is a
> misunderstanding somewhere.

Perhaps you can clear up the misunderstanding? What is it that you propose?
What is the command sequence for local and for global?