static int lastIndexOf(CharSequence cs, CharSequence searchChar, int start) {
        return cs.toString().lastIndexOf(searchChar.toString(), start);
//        if (cs instanceof String && searchChar instanceof String) {
//            // TODO: Do we assume searchChar is usually relatively small;
//            //       If so then calling toString() on it is better than reverting to
//            //       the green implementation in the else block
//            return ((String) cs).lastIndexOf((String) searchChar, start);
//        } else {
//            // TODO: Implement rather than convert to String
//            return cs.toString().lastIndexOf(searchChar.toString(), start);
//        }
    }
Used by the lastIndexOf(CharSequence methods) as a green implementation of lastIndexOf

@param cs the {@code CharSequence} to be processed
@param searchChar the {@code CharSequence} to be searched for
@param start the start index
@return the index where the search sequence was found
android/android_framework/base/src/main/java/lang3/CharSequenceUtils.java