Re: gnus should accept UTF8 even if UTF-8 is standard

[Richard M. Stallman]

    I think completing utf8 to utf-8 is the best solution as you and Stephen
    described, so it's worth some code.

It would look strange for completion to make such a change within a
word of the user's input.  It may be ok, but let's not forget the
easy alternative: accept that input without having it visibly change
in the minibuffer.

For instance, completing-read could accept a list of alternatives
that are valid if entered, but should not affect completion.