[michaelmior]

A lot of people already think about this problem with respect to API compatibility for REST services using the OpenAPI spec for example. It's possible to have a JSON Schema which is backwards compatible with previous versions. I'm not sure how backwards-compatible the resulting JSON BinPack schemas are however.

[jviotti]

Great seeing you over here Michael :) For other people reading this thread, Michael and I are collaborating on a paper covering the schema compiler I've been working on for JSON BinPack. Funny coincidence!