Then intent for this was for improving the storage of integer arrays,
especially in the context of sparse vectors. This would have the largest
impact on binary immutable vectors.
There are a few impinging factors. The first is that Lucene now has an
implementation of PFOR and PFOR-delta that shoudl provide much better
performance and slightly better compression. The second is the adoption of
colt and attendant digestion load. Jake would be the most likely consumer
of these routines, but he won't be looking for them for some time.
My vote is to mothball it.
Ted Dunning, CTO