RE: About how misspelled word are displayed

[Drew Adams]

> IOW, we now have not only Customize writing to your `custom-file'
> or init file; we have also the package system doing that.
> 
> It's questionable whether that's a great idea - a question that was
> discussed briefly on emacs-devel@gnu.org:...
> 
> One of the Emacs maintainers asked there whether we shouldn't use a
> different file for this.  But AFAIK that thread went nowhere.
> 
> An earlier thread also broached the question somewhat:... 

See also this thread, even earlier.  As soon as the package system
started writing to user init files (or `custom-file') people raised
the question of making it use another file or files.

http://lists.gnu.org/archive/html/emacs-devel/2014-06/msg00375.html