code: @Deprecated
      public void setElementAt(char start, char end, char value)
      {
          int i;
          if (isCompact) {
              expand();
          }
          for (i = start; i <= end; ++i) {
              values[i] = value;
              touchBlock(i >> BLOCKSHIFT, value);
          }
      }
docs: Set new values for a range of Unicode character.
  
  @param start the starting offset of the range
  @param end the ending offset of the range
  @param value the new mapped value
  @deprecated This API is ICU internal only.
  @hide draft / provisional / internal are hidden on Android