Kotlin readme example throws error: more elaborated code example for beginners needed?

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Hey, I'm trying to learn moshi by going through the readme. Trying one of the first kotlin example throws me an error though:

import Suit.*
import com.squareup.moshi.JsonAdapter
import com.squareup.moshi.Moshi
import com.squareup.moshi.adapter

@OptIn(ExperimentalStdlibApi::class)
fun main() {
    val blackjackHand = BlackjackHand(
        Card('6', SPADES),
        listOf(Card('4', CLUBS), Card('A', HEARTS))
    )

    val moshi: Moshi = Moshi.Builder().build()
    val jsonAdapter: JsonAdapter<BlackjackHand> = moshi.adapter<BlackjackHand>()

    val json: String = jsonAdapter.toJson(blackjackHand)
    println(json)
}

class BlackjackHand(
    val hidden_card: Card,
    val visible_cards: List<Card>,
)

class Card(
    val rank: Char,
    val suit: Suit
)

enum class Suit {
    CLUBS, DIAMONDS, HEARTS, SPADES;
}

Exception in thread "main" java.lang.IllegalArgumentException: Cannot serialize Kotlin type BlackjackHand. Reflective serialization of Kotlin classes without using kotlin-reflect has undefined and unexpected behavior. Please use KotlinJsonAdapterFactory from the moshi-kotlin artifact or use code gen from the moshi-kotlin-codegen artifact.
	at com.squareup.moshi.ClassJsonAdapter$1.create(ClassJsonAdapter.java:98)
	at com.squareup.moshi.Moshi.adapter(Moshi.java:146)
	at com.squareup.moshi.Moshi.adapter(Moshi.java:106)
	at com.squareup.moshi.Moshi.adapter(Moshi.java:75)
	at com.squareup.moshi._MoshiKotlinExtensionsKt.adapter(-MoshiKotlinExtensions.kt:40)
	at MainKt.main(Main.kt:34)
	at MainKt.main(Main.kt)

Process finished with exit code 1

I read the notice

Note: The Kotlin examples of this README assume use of either Kotlin code gen or KotlinJsonAdapterFactory for reflection. Plain Java-based reflection is unsupported on Kotlin classes.

and building moshi like explained at the end of the readme works:

val moshi = Moshi.Builder()
    .addLast(KotlinJsonAdapterFactory())
    .build()

My question is if the line val moshi: Moshi = Moshi.Builder().build() in the kotlin examples is meant in a more generic term (reflection vs. codegen) and because of this it's missing e.g. the the needed .addLast(KotlinJsonAdapterFactory()) part for reflective serialization?

If so, for me as a beginner just trying to follow the example a comment in the example code (and maybe a link down to the Kotlin section of the page) would be appreciated, e.g.

-> Readme.md

Kotlin

val blackjackHand = BlackjackHand(
    Card('6', SPADES),
    listOf(Card('4', CLUBS), Card('A', HEARTS))
  )

// for use with reflection use Moshi.Builder().add(KotlinJsonAdapterFactory()).build()
val moshi: Moshi = Moshi.Builder().build()
val jsonAdapter: JsonAdapter<BlackjackHand> = moshi.adapter<BlackjackHand>()

val json: String = jsonAdapter.toJson(blackjackHand)
println(json)

Otherwise one (or better I) was of the opinion the code was already a fully working solution...