Yes, I’m wondering if people have bad experiences with CBOR, thrift, flatbuffers, protobuf, messagepack, etc. There are a huge number. I think Protobuf might be the best choice across all languages at this point, maybe?

But that’s my question, if you choose a binary format, what are the issues to look out for?

Example, I work with Java, Rust, Go, and Python at work. I have specifically had issues with Avro (not my choice) which is really well supported in Java, but not much else.