bug#31715: cl-incf and cl-decf error out when passed a nil-valued variable as 'offset'

[Lars Ingebrigtsen]

Michael Heerdegen <michael_heerdegen@web.de> writes:

> It's not that super clear.  If we keep the current definition (though I
> would rather like to see this fixed if possible), maybe consider to add
> something like "If X is specified, it should be an expression that
> should evaluate to a number".

Reading this bug thread, different tweaks were suggested, but they all
seem to have various disadvantages.  So I think the conclusion here is
that doing this documentation clarification is the safest thing, so I've
now done so in Emacs 29.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no