docs: public boolean anyNull() {
  		// Skip the header.
  		if ((segments[0].getLong(0) & FIRST_BYTE_ZERO) != 0) {
  			return true;
  		}
  		for (int i = 8; i < nullBitsSizeInBytes; i += 8) {
  			if (segments[0].getLong(i) != 0) {
  				return true;
  			}
  		}
  		return false;
  	}