code: public void addStr(Chunk c, long row) {
      if( c.isNA_abs(row) ) addNA();
      else { addStr(c.atStr_abs(new BufferedString(), row)); _isAllASCII &= ((CStrChunk)c)._isAllASCII; }
    }
docs: TODO: FIX isAllASCII test to actually inspect string contents