I don't understand (but am open to be persuaded), isn't iteration in js now trivially easy and actually quite powerful? Especially since we can now put 'await' everywhere? What are the killer use cases for this lib?
- Some people like/prefer writing iteration in a functional style, which this library enables
- It's pretty easy to create unintentional async/concurrency bottlenecks with the simple `Promise.all` approach (see the home page example)
Maybe an in memory cache hit---that you explicitly code---causes a sync resolve to happen, woohoo!
But if it goes to IO and you are waiting for the event loop to schedule you back in you could be in for a shock even if the IO op is tiny. Especially doing it alot.
Only matters probably on a high CPU usage server which hopefully you avoid by scaling up on cpu and using all the cores.
On the other hand... you are being cooperative :)
But tight loop IO is an antipattern ... as is doing a lot---millions---of IO ops from node (per request or job) that you need to worry about this (use a different language for your DB server!).