What I wanted to point out is that typically a C struct is what you need. The common case is static keys and static value types but dynamic values. What are in

What I wanted to point out is that typically a C struct is what you need. The common case is static keys and static value types but dynamic values. What are interesting use cases for more dynamic (i.e. non-fixed set of keys / types)? I mean, if you need something super-abstract and flexible, you are unlikely to need a built-in convenient syntax to hardcode such values.