[karavelov]

No support for sum types? I didn't see even simple unions covered.

[adsharma]

https://adsharma.github.io/flattools-11222020.html

supports unions and 4 popular type safe languages. The idea is that you'd write decorators in those languages to implement functionality similar to ksy or write a template to generate ksy and reuse Kaitai tool chain.

[ta988]

Do you have any use case for these?