Re: Moving kbd to subr.el

[Gregory Heytings]

> > Hence the "create a specific notation for them if removing them is not 
> > possible".  E.g. use a "{string}" syntax in the (rare) cases where the 
> > current string-based syntax is necessary, and use the "string" syntax 
> > in all other cases.
>
> If you have the liberty to change the string, then you can always (or 
> close enough) use the kbd syntax.
>
> The reason to preserve the old syntax is to support old code that nobody 
> will/can update.

I understand this, although I'm not sure what "nobody can update" means. 
After all, changing a few characters here and there is not an infeasible 
task.  It's also why I wasn't suggesting to deprecate them in a near 
future, but progressively.  The warning in Emacs 29+N could even mention 
what the replacement string should be, something like: "Warning 
(define-key): "\C-ca" uses a deprecated syntax, it should be replaced by 
"C-c a"."