> Is that really true? Oh yes. For instance, LuaTeX doesn't print combining diacritics correctly unless you painstakingly swap the underlying codepoints around

> Is that really true? Oh yes. For instance, LuaTeX doesn't print combining diacritics correctly unless you painstakingly swap the underlying codepoints around in some unspecified order (to be determined through trial and error) that doesn't match _any_ of the Unicode normalization forms.