[Nathanba]

The thing about schemaless is that it's great for usability and I like it with JSON but as with JSON when we develop applications in reality at the end of the day you always have some kind of schema, whether it's written down or not. Like you alluded with pydantic, the application is going to rely on the data being in some sort of shape, even if it's very defensively written and practically everything is optional, you still end up relying something. That would be the informal schema so in my mind if I have a schema anyway no matter what... then maybe this should be supported in the serialization format/library to give me the benefit of size reductions.

[yetihehe]

I very often use the best of both worlds. Have schema for messages, but some messages have additional "info" field, which is typically json for other data not defined elsewhere or not added to every message.