RFC: reference counted Throwable

[ixid via Digitalmars-d]

> Fasten your seatbelt, it's gonna be a bumpy ride! :o)
>
> Andrei

The fundamentalness of the changes seem to be sufficient that one 
could argue it's D3. If you're going to make major changes 
wouldn't it be worth a fuller break to address some of the other 
unresolved and seemingly pretty major issues such as 
const/immutable and ref?