code: @Override
      public int insertAt(final int position, @Nullable final CharSequence input) {
          return insertAt(position, input, true);
      }
docs: Convenience method for {@link MaskImpl#insertAt(int, CharSequence, boolean)} that always
  places
  cursor after trailing hardcoded sequence.
  
  @param position from which position to begin input
  @param input    string to insert
  @return cursor position after insert