A fondness for this language led me to develop (for fun) my own take on POP11 a few years back. Its kind of ‘POP11 with braces’ (since it uses braces for block and function scope, etc.) — https://github.com/benhj/arrow if anyone is interested.. A lot slower though due to its recursive tree interpreter and no way near as powerful.. one day I might try and implement a byte code compiler / vm for it..