(Still not working 100%, but getting close.)
Additionally, start on the README, fix some type member visibility, add some
additional tests, tag some FIXMEs for where type conversions will take
place, and add `#rewind` for the query iterator.
FossilOrigin-Name: 490f27a4792d5243d82d90dcb12be1074c945c74d7fa63dd5baaf942ac42d7c9