[RFC] 9533: sixth iteration

[Pétur Runólfsson]

Paolo Carlini wrote:
> What do you mean exactly by "garbage" (*)? Could you provide 
> some more 
> info or,

encoding() always returns 4, max_length() always returns 1.
This is wrong for all encodings (I think it is provable that
max_length() >= encoding()).

> even better, a patch, enabling us to use safely the 
> much more 
> correct code on top?

Sure, just copy codecvt.cc and codecvt_members.cc from 3.4 :-)
Some changes need to be made to keep things ABI-compatible,
but in general this should be easy to backport.

Petur