Right, but you can write a decoder an let Transit convert your type to an equivalent type in another language. That's the whole point of Transit, interoperabil

Right, but you can write a decoder an let Transit convert your type to an equivalent type in another language. That's the whole point of Transit, interoperability with other languages. Having a good set of scalar types, basic composite types, and the ability to extend it with your own semantic types built recursively from the base types.