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Greek Σ has two lowercase forms — medial σ and word-final ς — and neither the candidate query nor the confirmation treated them as one letter. The GLOB scan built each character's class from a one-way reach that only arrived at ς when it started from ς, so a request for "ΑΣ" never admitted a stored "Ας". Classes are now built from a fold group — every character sharing an uppercase form — derived by scanning the cased ranges at module load the way ACCENTED_BY_BASE already is. It generalises past sigma on its own: dotless ı folds with i, long ſ with s, historic Cyrillic letterforms with В Д О С Т Ъ Ѣ. Only the 24 groups of 767 that a per-character fold would miss are kept. Admitting the row was only half of it. normalizeTitleKeys then compared "ασ" against "ας" and discarded it, because toLowerCase picks the sigma form by position. Both SQL tiers already folded them together — SQLite's trigram tokenizer does full Unicode folding natively, unlike LOWER() — so the JS confirmation was the only tier that did not, making this a pre-existing gap on the FTS path as well. Normalization now rewrites ς to σ after lowercasing, which is what Unicode case folding does. Guards unchanged: a case mapping that changes length (ß → SS, İ) or a GLOB metacharacter still returns null rather than a partial pattern.