Ispell, aspell, flyspell problem in xemacs

I added this in .xemacs/init.el
(setq ispell-extra-args'("--encoding" "none"))

to solve a problem where the ispell.el use by flyspell.el would call aspell without the encoding option, resulting in encoding incompatibilities between ispell and aspell. The wrong words were proposed when an error was discovered by flyspell.el. See also
http://lists.gnu.org/archive/html/aspell-user/2005-04/msg00001.html