I not sure about having names like `AtomicReferences`. There's guava's Atomics, and having our own thing that has an equally plausible name isn't appealing. Having mulled over the Exceptions versus Throwables naming, I now hesitantly prefer the names like Throwables2 and Atomics2 - it says that we're adding to what "gauva's standard libraries" offer and hope that in future versions we can remove more and more from our extension...