> malformed JSON structs of hacking BAD data structure/logic design
The real world is not particularly well structured.
> a business form in paper
There are several types of paper forms. They're typically differentiated by a type identifier (a.k.a. Title) in their headers. Scaling one layer out paper forms themselves are actually a "sum type." They have a common form factor which makes them useful but require an initial blind examination to understand the context of the rest of the document.
The real world is not particularly well structured.
> a business form in paper
There are several types of paper forms. They're typically differentiated by a type identifier (a.k.a. Title) in their headers. Scaling one layer out paper forms themselves are actually a "sum type." They have a common form factor which makes them useful but require an initial blind examination to understand the context of the rest of the document.