Part 5, Beyond Integers (as return type) to Bytes with Schema

[alycda]

The exercise runs in one (or more) track(s) of your choice. Whatever wins needs a library in all available tracks, should install in the workshop's Nix shell (for convenience of the workshop, but you can choose your own adventure with an "unsupported" option) and should make the contract visible (because the compiler won't check the bytes are correct FOR you, and will compile against whatever schema you provided at compile-time). Comment with the track and and format missing from the options below (also share if you've shipped one of these options before).

• Schema + codegen (Protobuf, FlatBuffers, Cap'n Proto...)
• Self-describing, no schema (CBOR, MessagePack...)
• Columnar arrays (Apache Arrow...)
• JSON (String... you have been warned)