Comment by jviotti

Compared to other serialisation formats, JSON BinPack analyses your data and derives custom encoding rules that are specific to the data at hand given all the context it had on it. That's why on JSON BinPack, the static analysis part is the most complex one by far, and why I'm building so much JSON Schema advanced tooling in https://github.com/sourcemeta/jsontoolkit (i.e. check the huge API surface for JSON Schema in the docs: https://jsontoolkit.sourcemeta.com/group__jsonschema.html)

Of course there is still a lot to do, but the idea being that what you get with JSON BinPack is extremely close to what you would have done for manually encoding your data, except that you don't have to worry about encoding things yourself :) Thus you get the best of both worlds: the nicety of JSON and the space-efficiency of manual encoding.