CPP13 — Fixed and truncation/rounding?

Suppose we have:

typedef fixed<4,3> FT;

interface I

;

Suppose the server does:

FT
I_impl::
op() throw(CORBA::SystemException)

There are lots more digits in the return value than what is expected by the
client. What should be returned to the client. The rounded value? The
truncated value?

Similarly, what if we have:

double d = 10000000;
return CORBA::Fixed(d);

Do we return 9.999 to the client (which is the best we can do in this case)?

Of course, it is the responsibility of the programmer to make sure that
nonsense such as the second case doesn't happen. But the spec has to say
what happens if it does happen

Also, the first case will be very common – what should happen in this case?