Every so often someone asks on this list for Unicode to be handled properly.  I 
did it myself.  Then other people have to explain how hard this is.  So here’s 
an article which, after introductory material, discusses the hard questions in 
Unicode:

<https://norasandler.com/2017/11/02/Around-the-with-Unicode.html>

Are two strings the same?
How long is a string?
How do you sort things in alphabetical order?

The first and third questions are requirements for implementing COLLATE in 
SQLite.  And the fact that the second question is a difficult one emphasises 
that one shouldn’t take Unicode as simple.

Simon.
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