fixes

components/casemap/src/casemapper.rs

@@ -306,6 +306,9 @@ impl CaseMapper {
     /// the string as a single segment (and thus only titlecasing the beginning of it). Performs
     /// the specified leading adjustment behavior from the options without loading additional data.
     ///
+    /// Note that [`TitlecaseMapper`] has better behavior, most users should consider using
+    /// it instead. This method primarily exists for people who care about the amount of data being loaded.
+    ///
     /// This should typically be used as a lower-level helper to construct the titlecasing operation desired
     /// by the application, for example one can titlecase on a per-word basis by mixing this with
     /// a `WordSegmenter`.

components/casemap/src/titlecase.rs

@@ -130,12 +130,12 @@ pub struct TitlecaseOptions {
 /// assert_eq!(cm.titlecase_segment_to_string("«hello»", &root, adjust_to_cased), "«Hello»");
 /// assert_eq!(cm.titlecase_segment_to_string("«hello»", &root, no_adjust), "«hello»");
 ///
-/// // Only changed in legacy mode:
+/// // Only changed in adjust-to-cased mode:
 /// assert_eq!(cm.titlecase_segment_to_string("丰(abc)", &root, default_options), "丰(abc)");
 /// assert_eq!(cm.titlecase_segment_to_string("丰(abc)", &root, adjust_to_cased), "丰(Abc)");
 /// assert_eq!(cm.titlecase_segment_to_string("丰(abc)", &root, no_adjust), "丰(abc)");
 ///
-/// // Only changed in legacy mode:
+/// // Only changed in adjust-to-cased mode:
 /// assert_eq!(cm.titlecase_segment_to_string("49ers", &root, default_options), "49ers");
 /// assert_eq!(cm.titlecase_segment_to_string("49ers", &root, adjust_to_cased), "49Ers");
 /// assert_eq!(cm.titlecase_segment_to_string("49ers", &root, no_adjust), "49ers");
@@ -250,7 +250,6 @@ impl<CM: AsRef<CaseMapper>> TitlecaseMapper<CM> {
         options: TitlecaseOptions,
     ) -> impl Writeable + 'a {
         if options.leading_adjustment == LeadingAdjustment::Auto {
-            // todo
             // letter, number, symbol, or private use code point
             const HEAD_GROUPS: GeneralCategoryGroup = GeneralCategoryGroup::Letter
                 .union(GeneralCategoryGroup::Number)