Re: Defaults for set-variable

[Richard M. Stallman]

    Then what about documenting it in the Emacs manual?  Customization always
    inserts the old value into editable fields in the customization buffer
    (though, not as a Lisp expression that set-variable reads), so I think
    this is a useful thing for users to know that set-variable can provide
    the old value for editing too, via M-n:

Ok.  Please install that patch.