Lastly, a subprocess running evaluation would decouple the API server from the evaluation backend. This client-server model whereas the GHC API is a single large monolith. This may not be specific to IHaskell but a user code failure means the whole kernel dies. This is bad for debugging. Sabela is more fault tolerant. In a subprocess model, handling Ctrl-C (interrupting a long-running computation) is actually much cleaner because you can send a SIGINT to the child process without risking the stability of the parent UI.
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— William Shatner (@WilliamShatner) March 4, 2026
At the end, my WASM module weighs 195 KB, compressed to 72 KB.