The SpacetimeDB launch video came up on my YouTube feed - and I was surprised the video didn't go at all into how it was implemented. I assumed it was proprietary magic, but then I was surprised to find it was opensource. That confused me more - to get the kind of semantics they were talking about I had assumed that it was pretty novel and if it was open source they should be leading with that.

Kind of bummed to see its essentially 2015-era React Flux in Rust around a mutex.