Simple FuturesUnordered alternative, but 0-unsafe.
Performance is even better than FuturesUnordered in some benchmarks.
taskset time: [3.7362 ms 3.8423 ms 3.9553 ms]
change: [-4.6928% -1.8529% +1.1773%] (p = 0.23 > 0.05)
No change in performance detected.
Found 1 outliers among 30 measurements (3.33%)
1 (3.33%) high mild
futures_unordered time: [4.0081 ms 4.1792 ms 4.3758 ms]
change: [-2.2008% +3.5122% +9.2941%] (p = 0.25 > 0.05)
No change in performance detected.
Found 3 outliers among 30 measurements (10.00%)
3 (10.00%) high mild
And it has a lock-free branch based on crossbeam-queue.