Revisit structure at runtime of allOf/oneOf/anyOf

[czechboy0]

Structure at runtime of allOf/oneOf/anyOf - today, we use nesting of structs to represent the nested schemas.

Could be represented as a single flattened struct that conforms to multiple protocols, one for each nested type, or some other way.

Things to keep in mind:

• lack of nested protocols in Swift
• cost of using existentials vs concrete types

[iDevPro]

allOf - is like inheritance but with struct it would be like big struct with embed fields from parent struct :)