deserialize method
Deserializes a value to an instance of BASE.
Implementation
@override
BuiltSetMultimap deserialize(value, DogEngine engine) {
return BuiltSetMultimap<K, V>((value as Map).map<K, Iterable<V>>((key, value) =>
MapEntry<K, Iterable<V>>(deserializeArg(key, 0, engine),
(value as Iterable).map((p0) => deserializeArg(p0, 1, engine) as V).toList())));
}