Ajv, the JSON-Schema validator doesn't work on Cloudflare Workers.. It relies on eval()'d code generation, and CF workers don't allow eval().

I was surprised to find that it worked perfectly fine in Cloudworker. I think it's because ajv doesn't actually use eval(), it uses the new Function(<string>) constructor, which we patch into the runtime environment here.

For consistency, we should find a way to disable that mechanism without breaking the foo instanceof Function construct.