Note that nothing in the script is run automatically when the script is loaded, as happens in many other scripting language. The host application decides which functions and filtermaps it extracts from the script and when to run them.

So it's closer to something like C or C++, where it just defined stuff and you can choose what to use? I guess that's fine when there's no initialization for the script to do. Maybe in your domain that's never the case. But many languages end up adding static initialization as a first-class feature eventually.