Neat! It looks as though it's not aimed at high performance, though, since I didn't see any support for indexes in the source code.
I'm kind of working in the opposite direction — I've got a Nim API for libmdbx, which is extremely fast but just a raw key/value store. I'm adding indexes to it now and plan to add structured data. (I've got an earlier project in C++ using libmdbx that supports a subset of SQL.) It might be interesting to join our projects.
