code: func newBufferedReadSeeker(readSeeker io.ReadSeeker, size int) bufferedReadSeeker {
  	return bufferedReadSeeker{
  		r: bufio.NewReaderSize(readSeeker, size),
  		s: readSeeker,
  	}
  }
docs: // newBufferedReadSeeker creates a new instance of bufferedReadSeeker,
  // out of io.ReadSeeker. Argument `size` is the size of the read buffer.