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protobufs are fairly wide spread... from action script to erlang to haskell to visual basic.

Last time I tried (6 months ago) I couldn't find a proto3 implementation for Haskell that was complete ( https://github.com/google/proto-lens doesn't do Any, https://github.com/alphaHeavy/protobuf doesn't do proto3). Maybe one exists, or I could use proto2 and rewrite the other system I was working with.

I decided it was easier in my case to just output JSON.

Dang, `protobuf` doesn't support proto2? I'm kind of a Haskell die-hard, this is a big hole in our ecosystem=(

You don't really need proto3, though. Proto2 is compatible and proto3 mostly only removes features.

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