Yup. I just did a similar thing in guile (using sandboxed environments). as a scheme weenie I feel like I am looking at a world of people re-discovering things

Yup. I just did a similar thing in guile (using sandboxed environments). as a scheme weenie I feel like I am looking at a world of people re-discovering things I have taken for granted since... forever? I went from trying to embed python in a C application to embedding TCL and was blown away how easy it was, and that it supported threads. this was back in 2003 I remember trying it with lua, but the parallelism story wasn't really great until at least 5.1. TCL did it right from 8.4 and things hasn't really changed since, except that Lua catched up.