docs: synchronized void closeChunk( NewChunk chk) {
      final int cidx = chk._cidx - _chunkOff;
      if( cidx >= _espc.length ) {
        int newlen = Math.max(_espc.length * 2, cidx + 1);
        _espc = Arrays.copyOf(_espc,newlen);
      }
      if(_chunkTypes.length < _espc.length)
        _chunkTypes = Arrays.copyOf(_chunkTypes,_espc.length);
      _espc[cidx] = chk._len;
      _chunkTypes[cidx] = chk.type();
      _naCnt += chk._naCnt;
      _strCnt += chk._strCnt;
      for( int i=0; i<_timCnt.length; i++ ) _timCnt[i] += chk._timCnt[i];
      _totalCnt += chk._len;
    }