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> So, I'd really like to deprecate the whole interface in favor of either a
> read-only interface:
>
> x.sign -> 0 or 1 (perhaps even 1 or -1)
> x.coeff -> Python integer
> x.exp -> Python integer
> 
> If x is special, raise InvalidOperation. People usually need to check for
> specials anyhow.
Sure; that works for me. I don't like the current interface any more than you do, and I've always found it unnecessarily awkward to turn finite decimals into triples and back again.
But I think that's a different issue. What we have here is a real regression that seems likely to break existing code, and I think that should be fixed.