code: @Deprecated
      protected int doCompare(CharSequence left, CharSequence right) {
          return compare(left.toString(), right.toString());
      }
docs: Compares two CharSequences.
  The base class just calls compare(left.toString(), right.toString()).
  Subclasses should instead implement this method and have the String API call this method.
  @deprecated This API is ICU internal only.
  @hide original deprecated declaration
  @hide draft / provisional / internal are hidden on Android