parcelable_on_diet__status.kt

companion object : Parceler<Task> {

    override fun create(parcel: Parcel): Task {
        return Task(
            //...
            parcel.readStatus()
        )
    }

    override fun Task.write(parcel: Parcel, flags: Int) {

        with(parcel) {
            //...
            writeStatus(status)
        }
    }
}

fun Parcel.readStatus(): Status {
    return readLong().let { value ->
        when (value) {
            0L -> NotStarted
            1L -> InProgress
            else -> Completed(LocalDate.ofEpochDay(value))
        }
    }
}

fun Parcel.writeStatus(status: Status) {
    when (status) {
        is Completed -> writeLong(status.completedAt.toEpochDay())
        InProgress -> writeLong(1)
        NotStarted -> writeLong(0)
    }
}