Not sure which spec the article is referring to but it's not the one implemented by V8 natively.

> The problem is that Promises have to be resolved in the next turn of the event loop. This is part of the spec.

That statement is false unless I'm missing something major here. Promises aren't resolved in the next turn of the event loop. They should be resolved as part of the microtask queue which can happen at the end of the tick (recursively).

Example (tested on node 8):

    Promise.resolve()
      .then(() => console.log('1'))
      .then(() => console.log('2'))
      .then(() => console.log('still the same tick!'));
    setTimeout(() => console.log('timeout happening in the next tick'), 0);

Result:

    1
    2
    still the same tick!
    timeout happening in the next tick

The same will happen with async functions:

    (async () => {
      console.log(await Promise.resolve('1'));
      console.log(await Promise.resolve('2'));
      console.log(await Promise.resolve('still the same tick!'));
    })();
    setTimeout(() => console.log('timeout happening in the next tick'), 0);