Cased - Yes
Yes is the designation for characters that inherently possess the distinction between uppercase and lowercase forms, meaning they have a defined case mapping to both a lowercase and an uppercase counterpart. This includes letters from scripts like Latin, Greek, Cyrillic, and Armenian, as well as characters like Roman numerals and circled letters that have such mappings. The value applies to both simple and full case conversions, covering characters that can change case in isolation or in context, such as the Greek final sigma. It excludes characters like numbers, punctuation, or those with only one case form, such as titlecase letters or uncased symbols. The presence of this value helps identify characters that participate in case operations, enabling functions like case-insensitive matching or case conversion to work correctly across diverse writing systems.