documentation deficiency: turning off font-lock-mode with certainty

[Dan Jacobson]

In help, the user is presented with no way to turn off font-lock-mode
with certainty, I mean just saying (font-lock-mode) in a script will
also end up turning it it on if its off,
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font-lock-mode is an interactive Lisp function in `font-lock'.
(font-lock-mode &optional ARG)

Toggle Font Lock mode.
With arg, turn Font Lock mode on if and only if arg is positive...
[uh oh, same doc probem with global-font-lock-mode]
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Ok, then with no arg it is a toggle, ok. With negative or 0 arg.?
Hmm, I'll try it: (font-lock-mode -1)^X^E, ok, seems to turn it off,
OK, mention this.  Also give this example I found in the source:
  ;; Turn off Font Lock mode if it's on.
  (when font-lock-mode
    (font-lock-mode))
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