override suspend fun WriteContext.encode(value: HashSet<Any?>) {
        writeCollectionCheckingForCircularElements(value)
    }

    override suspend fun ReadContext.decode(): HashSet<Any?> =
        readCollectionCheckingForCircularElementsInto(::LinkedHashSet)
}


private
suspend fun WriteContext.writeCollectionCheckingForCircularElements(collection: Collection<Any?>) {
    var writeCircularMarker = true