proposal: pool.flat

[Slava Bereza]

private finish_purchase = pool(async () => {
    if (this.finish_purchase.count > 1) return; // not count.val here
  });

[Slava Bereza]

const a = pool(async () => {
    if (a.count.val > 1) return a.threads[0].promise; // Return promise from first thread
}

assert(a.flat.pending === false);
assert(chan(async () => {}).flat.pending === false);

[Slava Bereza]

Added to "the stream of conciseness 0.7+ roadmap"