A DBIN represents an Duplicate Bottom Internal Node in the JE tree.
Obsolete in log version 8, only used by DupConvert and some log readers.
Full key for this set of duplicates.
For Sizeof, set all array fields to null, since they are not part of the
- true if this node is a duplicate-bearing node type, false
For unit test support:
- a string that dumps information about this IN, without
DBINS need to dump their dup key