Re: `aset` on strings, changing the size in bytes

[Richard Stallman]

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  > But if I'm mistaken, and the current implementation does cons a new
  > string, then what is your problem with it?  The original string is not
  > mutable, it's just replaced wit ha new one.

"Replaced with the new one" requires relocatable strings.

But suppose we made a function like aset which returned
the string.  That way, it could return a new string when necessary.
It would be used like

   (setq s (sset s idx newchar))

Or we could define it to replace a substring:

   (setq s (srep s from to newsubstring))

It could also accept a regexp as FROM
and a match-string number as TO.  srep would always
make a new string, and nsrep would modify a string in place
if that is possible.

-- 
Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)