How stable is

atomicfu

? Is it OK to use it in a library as implementation details?

It's used by the coroutines library, so certainly stable enough. There are some rough edges, but I haven't seen anything showstopping.

JB doesn’t really advertise it for community use. I’d have to dig up the conversation link somewhere, but it’s kind of an internal library that you can use. I’m sure it works fine, but I’m not sure how committed they are to keeping the api itself stable over time. My original plan was to pull all of the Stately atomic classes, but after reading that, I held off.

Yeah, I will also keep custom atomics for a while.