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Tiny bit of context I'd also call out is that one of the primary authors comes from WhatsApp IIRC, with an extensive Erlang background.

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If you've ever used an ML descendant you'll miss sum types wherever you go. If you've ever used Erlang you'll miss the OTP actor implementation wherever you go.

I have good news for you, Gleam, built on top of Erlang, supports sum types

Yeah I do lol. It was the big motivation since we were writing more and more rust and missed the concurrency model. Please feel free to ping me for any further questions

It's come a long way since it started and I'm thrilled I can talk about it publicly now and it's usage at Meta (some at least lol).

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