(You still haven't demonstrated how you can get those four to exist with only two string types)
You know that +1 and the assigned \0 in your code, don't allocate +1 and don't put \0 and there you go.
The \0 is not required, but much XS assume it's there.
Read as: If sv contains the character string "\x80\x81",
I don't understand. How is calling a byte string a character string useful? Why would you do that? It's not technically wrong, but it's definitely not clearer.
I realize that C calls both bytes and characters char, but I don't think that's something to aspire to.
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