Why doesn't the MutableList get encoded to JSON? I...

# serialization

[Adam S]

Why doesn't the MutableList get encoded to JSON? It only prints {}

import kotlinx.serialization.*
import kotlinx.serialization.json.*

fun main() {
    val a = A()
    println(a)
    println(Json.encodeToString(a))
}

@Serializable
data class A(
    val list: MutableList<String> = mutableListOf("a", "b", "c"),
)

A(list=[a, b, c])
{}

https://pl.kotl.in/iubN0SLUB

[ephemient]

https://kotlinlang.org/api/kotlinx.serialization/kotlinx-serialization-json/kotlinx.serialization.json/-json-builder/encode-defaults.html
https://kotlinlang.org/api/kotlinx.serialization/kotlinx-serialization-core/kotlinx.serialization/-encode-default/