According to @schneems who is responsible for the release, this is supposed to fix an issue for those of you "who share a cache in different directories between deploys", which includes Heroku deployments.
Concurrency is hard, but Rails might have finally cracked the nut. You might not know that Active Support offers a way to write to a file atomically with File.atomic_write.
Even if you have heard about it, you probably didn't realize there is a subtle race condition in its implementation. Anyway, with this patch landing on master, those bugs will soon be behind us and we can all just sit back and enjoy the convenience it provides.
Along those same lines, it turns out that testing the same thing twice doesn't provide much value either.
🙈 Wrapping Up 🙈
That's all for This week in Rails. As always, there are many more changes than we have room to cover here, but feel free to check them out yourself!
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