Case folding fills a gap: the JDK ships no Unicode case folding.
byte[] folded = StringZilla.caseFold("Straße".getBytes(UTF_8)); // → "strasse" (ß folds to ss)
StringZilla.Match match = StringZilla.uncasedIndexOf(haystack, needle); // caseless search
byte[] composed = StringZilla.normalize("é".getBytes(UTF_8), StringZilla.NormalForm.NFC); // "e" + U+0301 → "é"
byte[] ascii = StringZilla.normalize("fi".getBytes(UTF_8), StringZilla.NormalForm.NFKC); // ligature "fi" → "fi"
byte[] key = StringZilla.normalize("Straße".getBytes(UTF_8), StringZilla.NormalForm.NFKC_CASEFOLD); // → "strasse"