bug#58513: describe-function should say that defconst variables are constant

[Richard Stallman]

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  > And then, in a later Emacs version, we could start enforcing the
  > constness in running code.

defconst has had a subtle meaning: "It is ok to expect, in certain
limited ways, that the value will not be altered."  Nothing more.

This change may seem to be fixing a bug, but some old programs used to
take advantage of the actual old meaning.  This change might break
them.

I think that would be asking for trouble, and we have better things to
do than deal with that trouble.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)