Re: Getting more info on a variable in Customize buffers

[Richard Stallman]

       AFAIR, set-variable by now obeys the :set function.  So everything
       that is user-visible behaves consistent.

    No, that was never implemented.  I do not know whether we still want
    to implement it before the 21.4 release.  It does not seem very
    difficult for setting default values, but setting buffer local values
    still would not call the :set functions (because :set functions are
    designed to set _default_ values and hence often can not be used to
    set buffer local values).

We could add defcustom properties :get-local and :set-local
to handle local values.  This could be useful for running Custom
buffers to set things locally, also.