I can't believe this has not been linked yet: <https://nim-lang.org/blog/2020/10/16/version-140-released.html>
Hacker news post and discussion: <https://news.ycombinator.com/item?id=24800161> Reddit post and discussion: <https://www.reddit.com/r/nim/comments/jcdbvu/nim_version_140_released>/ Congratulations to everyone who contributed. New ORC thing is awsome! Here is leorize comment that explains what is going on. Nim's current async implementation creates a lot of cycles in the graph, so ARC can't collect them. ORC is then developed as ARC + cycle collector to solve this issue, and it has been a success. This 1.4 release introduces ORC to everyone so that we can have mass testing for this new GC and eventually move torwards ORC as the default GC.
