ImmutableMapSerializer
class ImmutableMapSerializer<K, V>(keySerializer: KSerializer<K>, valueSerializer: KSerializer<V>) : KSerializer<ImmutableMap<K, V>>
Serializes an ImmutableMap the same way a plain Map would (delegating entirely to MapSerializer), converting back to ImmutableMap on decode — the map-shaped counterpart of ImmutableListSerializer. Reached via the SerializableImmutableMap typealias.