keidrych
commented
5 years ago Cap'n Proto is also worth looking at.
Additionally, the necessity of these approaches may not be applicable as a well designed stream architecture can be an alternative to their need
https://github.com/fastify/fastify-accepts-serializer
Capabilities should be present for multiple content types.
The direction is to recommend Flatbuffers but Avro should be explained how to implement as well.
For understanding on the necessity of this discussion is here