Changes When Casefolded - Yes
Yes is the indicator that a character’s casefolded form differs from its original code point, meaning that when the full casefold mapping is applied, the character transforms into one or more distinct characters or sequences. This value applies to letters and symbols that are affected by case-insensitive comparisons, such as the German sharp s (ß), which casefolds to "ss", or the Greek sigma, which folds to a single form. For any character marked with "Yes", the casefold operation changes its identity, so string equality checks that ignore case must account for this transformation. In practice, this flag helps ensure that case-insensitive matching remains consistent across scripts, especially where simple lowercasing or uppercasing would fail to align equivalent variants.