Thanks for your feedback.

I know that normally you wouldn't use NFKD for normalization to reverse a string, this was just a trick to show that 1) different normalizations can behave make reverse differently and 2) there are cases where it doesn't work the way you want.

Surely I won't give an introduction to Unicode normalization here, partly because I don't really grok it, partly because it's just too big to fit in a tutorial that focuses on something else.

Anyway, I hope the tutorial is now a bit clearer on why I used NFKD here, and that it's a normal thing to do.