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Source code fixed.

Line 181 in SortedIterator.java was:

return (nodeKeys[b1+i]==null ? 0 : -1);

should be:

comp = (nodeKeys[b1+i]==null ? 0 : -1);

In fact the problem is more severe that originally
described; if one sort key is null for both items, then
subsequent sort keys are not being examined.

MK