bug#40671: [DOC] modify literal objects

[Richard Stallman]

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  > That is an interesting point. What is the difference between
  > CANNOT and SHOULD NOT, operationally? To the user, nothing; there
  > is no gain from disobeying our advice.

It makes a big practical difference to programmers.

CANNOT means "If you try to chsnge it, it won't change",
and probably also "That will trigger a diagnostic."

SHOULOD NOT means "if you try to chsnge it, it will give you no
diagnostic and the value will seem to have changed, but afterward
bizarre things may happen."

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