Stefan Monnier wrote:

> The "iff" idiom is sufficiently common that we don't want to shy
> away from it just at this one place. So either we rule it out
> everywhere, or we use it liberally.

Sufficiently common in Emacs (~ 600 instances); I've never seen it
anywhere else as far as I remember. All it does is save some typing at
the expense of confusing people from time to time. Personally, I think
it should not be used.



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