Since the Part 1 didn't get discussed yet, I've merged the comments into this submission, which has it:

Zeroperl: Sandboxing Perl with WebAssembly - https://news.ycombinator.com/item?id=43017739

Readers may want to read both of course!

hey, it's great to see partial support for scheme's continuations (or common lisp's restart system)!

that old adage continues to be true: any sufficiently complex web scripting runtime will eventually implement about half of common lisp :)