I've spent about a year thinking about v4 and about 12 hours writing it (most of which has been re-factoring older code and wondering how drunk I was when I wrote it). If you look at the repo today, most of it looks and feeds like v3 but with most of the complexity removed (eg: lots of refactoring for performance and readability). Last night, I was able to get "pings" flowing back and forth between the client and the storage thread, which is good sign...
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