Case Ignorable - Yes

Yes is the designation for characters that can be safely ignored when determining case distinctions, meaning they neither contribute to nor block a case fold or case conversion between uppercase and lowercase forms. These include formatting marks, zero width joiner and non joiner, word joiner, soft hyphen, and certain combining marks, as well as characters like apostrophe and hyphen variants that are excluded from case comparison. When a string is compared for case insensitivity, these characters are effectively skipped over, so that "a" and "A" match regardless of intervening such marks. This ensures that visually distinct strings with extra diacritics or joiners are treated as equal in case folding, while still preserving their presence in the original text.