[quasilyte]

I see three main approaches for the tasks projects like ecaml and goism try to solve:

1. Use a plugin system (ecaml)

2. Transcompile to a target language (gosim and emscripten-like platforms)

3. Embed another VM inside Emacs and call its eval

There are many differences between these approaches and I am not sure one of them is objectively better as a general solution.

For the end users, all of these approaches can deliver good level of integration (they require different sets of tricks to achieve that).