On 05/31/2017 02:24 PM, Alan Mackenzie wrote:
> This bug has not been fixed.

Oh, sorry, I misunderstood your earlier comments. I reopened the bug.

> The only documentation for this feature is obscure and hidden.  There
> is nothing in `message''s doc string which explicitly states likely
> unwanted replacement of characters takes place; just a puzzling
> "exception proves the rule" paragraph.
I installed the attached patch into master, which I hope makes that doc 
string sufficiently clear. I'd rather not change the Emacs default 
behavior, though, for reasons already discussed.