Class Interpreter

Pump the evaluator to completion and return its result. Convenience over startCoroutine for the non-suspending case (a script with no wait / every / when / engaged-step) — it awaits the coroutine's settlement. A suspending script driven this way only settles once the game clock advances, so suspend-bearing callers use startCoroutine + advance the clock instead.

Evaluate an argument to a value. Public so P3 builtins (set name (expr)) and tests can evaluate args directly. A {block} arg becomes an inert Block capturing the current scope.

Invoke a block: run its body in a fresh child of its captured scope (the closure), yielding its last statement's value. May suspend (P5) since the body can contain wait. Public — the keystone primitive P3 control-flow builtins drive.

Start a Coroutine over this script and begin pumping it. The coroutine handles every effect — dispatch (with the await-engaged pacing rule), slice (preemption), and suspend (game-clock wait / every / when) — and may detach (run on in the background across scheduler frames) without blocking the caller. The handle exposes whenFirstYield() (resolves on the first suspend or on completion — the detachment point) and whenSettled() (resolves when the run finishes or is cancelled), plus cancel().