Yeah, but it’s a schema-less, self-describing data format. It’s not like a specific position in a data stream has a requirement to be a specific type. I can se

Yeah, but it’s a schema-less, self-describing data format. It’s not like a specific position in a data stream has a requirement to be a specific type. I can see why sum types would be useful in a schema or for the elements of a collection that is required to be homogeneous (ie. List<Foo|Bar>). For what use case would one use custom sum types in a schema-less data format?