* <li><b>DO_REHASH</b> Instead of storing the hash-values, recalculate
* them on demand from the datavalues. (useful if
* calculating the hash-values takes less time than
* <li><b>DO_REHASH</b> Instead of storing the hash-values, recalculate
* them on demand from the datavalues. (useful if
* calculating the hash-values takes less time than