bug#4102: 23.1.50; recentf-mode nil but toggles

[Xah Lee]

gosh, stung by this bug.

in my elisp code, i have:

(recentf-mode nil)

this should turn it off, but actually it toggles.

here's a quote of its inline doc:
«
(recentf-mode &optional arg)

Toggle recentf mode.
With prefix argument arg, turn on if positive, otherwise off.
»

this is reproduciable in the following:

GNU Emacs 23.1.1 (i386-mingw-nt6.0.6002) of 2009-07-29 on SOFT-MJASON

GNU Emacs 23.1.50.1 (i386-mingw-nt6.0.6002) of 2009-06-30 on LENNART-69DE564 
(patched)

 Xah
∑ http://xahlee.org/

☄