async · await Native only

Experimental — the native event loop is still gaining backend coverage.

Asynchronous code runs on a native event loop. The program drains pending callbacks and promises before it exits.

API	Notes
`async function f(): Promise<T> { … }`	declares an async function
`await expr`	awaits a `Promise<T>`, yields `T`
`Promise.resolve(x)`	T → Promise<T>
`setTimeout(fn, ms)`	(() => void, int) → int — schedules a callback after a delay, returns a handle
`clearTimeout(id)`	int → void — cancels a pending `setTimeout`
`setInterval(fn, ms)`	(() => void, int) → int — repeats a callback every delay until cancelled
`clearInterval(id)`	int → void — cancels a running `setInterval`; the same underlying function as `clearTimeout`, two names to match Node