Structure kind for lists and arrays of an arbitrary length. Serializers typically encode classes with calls to Encoder.beginCollection and CompositeEncoder.endStructure, writing the elements of the list between these calls. Built-in list serializers treat elements as homogeneous, though application-specific serializers may impose application-specific restrictions on specific LIST types.
Example of such application-specific serialization may be class
class ListOfThreeElements() : List<Any>, for which an author of the serializer knows that while it is
List<Any>, in fact, is always has three elements of a known type (e.g. the first is always a string, the second one is always an int etc.)