bug#47992: 27; 28; Phase out use of `equal` in `add-hook`, `remove-hook`

[Richard Stallman]

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  > If they are equal, why do they need to be distinguished?

If file A adds such a hook, then file B adds one that is the same,
then you unload file B, testing for "the same hook" would
leave none.  But A won't work right without its hook.

My scheme would put on two distinct but equivalent hooks,
then delete one of them, leaving the other in place.
In some cases, that's what you want.

-- 
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)