[timewizard]

> 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.