It's in LuaJIT, which lets me use first-class environments to separate the client-server relationship while running everything in a single Lua_state.

The (long) roadmap involves implementing the Jupyter protocol, adding a client library which can be injected into production code, and eventually using that common basis to extend it to the other languages supported by Jupyter, and any others which choose to do the groundwork.

Bringing in all of ZeroMQ is a lot of work I've been putting off, but I need it all over the place.