Well, in most apps you will layer both kinds of models. You’ll have SQL which is declarative, but you’ll call those queries as procedures. The boundaries around a React component are declarative, but the render function is procedural.

So when I talk about declarative models I’m talking about the Swiss cheese of declarative models with procedures mixed in.

In moxie, everything is procedural, as it were. The declarative syntax is a way to invoke "imperative but idempotent" functions, and the core runtime provides tools for wrangling mutability and repetition in those functions.