I recently evaluated these, and I'm dying to use something like this. I would really love to be able to do this with sandboxed apps written in arbitrary languages like Go, Haskell, Rust, or even C++. Ideally, I wouldn't be managing docker containers or VMs to get certain jobs done.

Unfortunately, it's limited to JavaScript, Python, and Java for now. Google Cloud Functions is similarly limited to JavaScript.

I know that these languages were chosen because they can be easily sandboxed, but it would be nice to support something more generic without having to create docker containers for everything.