[jaffathecake]

The spec defines the execution of tasks vs microtasks tightly, the bit that's less clear is how ECMAScript promise jobs interact with microtasks - the consensus is they're in the same queue, but it isn't explicit.

I agree that we should have an API to queue microtasks, although as soon as promises use microtasks, Promise.resolve().then(func) becomes that API. Some promise polyfills also use mutation events to queue microtasks.