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Re:Cdecl – Turns English phrases into C declarations by exitcode00 on Monday January 07, 2019 @04:28PM (#18850319)
These are solved problems though and unicode identifiers are rare in practice...

See Normalization Form KC and Clause 21 of ISO/IEC 10646:2017.

"Normalization forms are the mechanisms allowing the selection of a unique coded representation among alternative; but equivalent coded text representations of the same text. Normalization forms for use with ISO/IEC 10646 are specified in the Unicode Standard UAX#15..." yada yada

Re:Cdecl – Turns English phrases into C declarations by jcranmer on Monday January 07, 2019 @07:23PM (#18851755)
Unicode normalization doesn't actually solve a single problem I mentioned. All of the listed characters are equal to themselves in both NFC and NFKC.

Also Unicode identifiers aren't rare in terms of language support. Most of the popular languages support them--C/C++, C#, Java, PHP, Python, Perl, Swift, Go, Rust, Ruby, JavaScript, even Ada. It's actually difficult to find a popular language that prohibits Unicode identifiers entirely (MATLAB does, not sure about Visual Basic).