Customize buffers are marked modified (**) in mode line

[Drew Adams]

emacs -q
Options > Customize Emacs > Specific Group - faces (or equivalent)

The buffer *Customize Group: Faces* is considered modified (** in mode
line). Is this correct behavior? Is the buffer modification flag intended to
show user changes in this buffer? Does it usefully show anything, or should
it be kept as "--" or "%%"?

In GNU Emacs 21.3.50.1 (i386-mingw-nt5.1.2600)
 of 2004-07-26 on BERATUNG4
configured using `configure --with-gcc
(3.3) --cflags -I../../jpeg-6b-1/include -I../../libpng-1.2.4-1/include -I..
/../tiff-3.5.7/include -I../../xpm-nox-4.2.0/include -I../../zlib-1.1.4-1/in
clude'