- lfsr_btree_lookupnext_ => gives you the underlying rbyd/rid, intended
for btree-internal use.
- lfsr_btree_lookupnext => does not give you underlying rbyd/rid, used
for general purpose lookups/iteration.
This is for consistency with other *_lookupnext functions, and
discourages use of the leaf rbyd/rid. These are sensitive to internal
btree state.
Christopher Haster
3625882343