I'm actually running right now with an Emacs that does signal such errors.
I've changed the notion of "multibyte/unibyte" string by saying:
- [same as now] if size_byte < 0, it's UNIBYTE.
- [same as now] if size_byte > size, it's MULTIBYTE.
- [changed] if size_byte == size, it's neither/both (ASCII-only).
That is a far-reaching change. It would have to be thought about
theoretically, not just tried.
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