"trampoline business"? It supports nearly arbitrary imports of anything you want. How much more flexibility do you need? You could provide an `eval` function

"trampoline business"? It supports nearly arbitrary imports of anything you want. How much more flexibility do you need? You could provide an `eval` function to run arbitrary code with a small amount of effort. Is the problem that Emscripten and/or Rust haven't laid it all out on a platter?