Re: window-buffer-change-functions

[Richard Stallman]

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I'm glad to have contributed improved documentation for the current
behavior of window-buffer-change-functions, but that behavior violates
the abstraction of variable bindings.

A variable is supposed to have one value at any given time.  It might
be the default binding, or a something-local binding.  But regardless
of why that binding is current at any time, its value is _the value_
of the variable at that time.  The other bindings shouldn't affect
what the variable stands for when they are not current.

Special exceptions that undermine the meaning of a variable's value,
or any general design principle, cause conceptual confusion that will
get us in 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)