Jonathan Edwards recently uploaded the Subtext 1 demo (from 2005) to Vimeo. I hadn't been able to view it previously (thanks to Flash).
It has a lot of interesting takes - and most (all?) that I agree with. E.g. edit time name resolution, debugging by inspection, a concrete model of time, inline expansion of function calls, and more.
Check it out:
https://vimeo.com/451278506