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From: Thiago Adams <thiago.adams@gmail.com>
Newsgroups: comp.lang.c
Subject: multi bytes character - how to make it defined behavior?
Date: Tue, 13 Aug 2024 11:45:42 -0300
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static_assert('×' == 50071);

GCC -  warning multi byte
CLANG - error character too large

I think instead of "multi bytes" we need "multi characters" - not bytes.

We decode utf8 then we have the character to decide if it is multi char 
or not.

decoding '×' would consume bytes 195 and 151 the result is the decoded 
Unicode value of 215.

It is not multi byte : 256*195 + 151 = 50071

O the other hand 'ab' is "multi character" resulting

256 * 'a' + 'b' = 256*97+98= 24930

One consequence is that

'ab' == '𤤰'

But I don't think this is a problem. At least everything is defined.