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whatwggon Psyche: A domain specific language designed for creating WebAssembly modules

Nim (higher level than C) creates small binaries and uses Emscripten to produce WASM.

whatwggon High-performance, exactly-once, failure-oblivious distributed programming (2018)

My understanding is that Exactly Once Processing to Completion" is not the same as "Exactly Once Processing." In the former, any side effect is not committed until the processing has completed, and if you have an externally consistent database then you can have exactly once processing [to completion]. What am I missing?