use icu::properties::CodePointSetData;
use icu::properties::props::ChangesWhenTitlecased;
let changes_when_titlecased = CodePointSetData::new::<ChangesWhenTitlecased>();
assert!(changes_when_titlecased.contains('æ')); // U+00E6 LATIN SMALL LETTER AE
assert!(!changes_when_titlecased.contains('Æ')); // U+00E6 LATIN CAPITAL LETTER AE