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!

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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 :)