Re: 23.0.50; utf7-decode failed with non latin-1 charactor

[Jason Rumney]

Kenichi Handa wrote:
> It seems that fucntions utf-7-decode and utf-7-encode are
> designed to be called only as pre-write/post-read functions
> of a coding system utf-7 (and commented out coding system
> utf-7-imap) in lisp/international/utf-7.el.
>   

Is it a requirement for such functions to return nil?
If not, can we return the encoded string instead of nil, to make the
undocumented string FROM argument useful (as a drop in replacement for
the gnus utf7-encode).