I think it should not be considered valid to decode a multibyte string,
whether the string happens to only contains ASCII (or ASCII+eight-bit-*)
or not.
But what would it mean, in the other cases?
I see I misread the message the first time--I didn't see the "not".
Now that I see it, I think maybe I agree.
If you have a multibyte string that makes sense to decode, and you
want to decode it, you could call string-as-unibyte first. That would
be a way of overriding the error-check. It would not be hard to do,
and it would prevent people from falling into problems that are
mysterious because they don't know that the program decodes multibyte
strings.
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