docs: protected boolean isPrefixBlock(long divisionValue, long upperValue, int divisionPrefixLen) {
  		if(divisionPrefixLen == 0) {
  			return divisionValue == 0 && upperValue == getMaxValue();
  		}
  		long ones = ~0L;
  		long divisionBitMask = ~(ones << getBitCount());
  		long divisionPrefixMask = ones << (getBitCount() - divisionPrefixLen);
  		long divisionNonPrefixMask = ~divisionPrefixMask;
  		return testRange(divisionValue,
  				upperValue,
  				upperValue,
  				divisionPrefixMask & divisionBitMask,
  				divisionNonPrefixMask);
  	}