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JS serialization fails for empty lists with non-primitive types #613

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@Daeda88

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@Daeda88
@Test
    fun encodeDecodeNestedClassWithEmptyCollections() {
        val module = SerializersModule {
            polymorphic(AbstractClass::class, AbstractClass.serializer()) {
                subclass(ImplementedClass::class, ImplementedClass.serializer())
            }
        }

        val testData = TestData(mapOf(), mapOf(), true, null, ValueClass(42))
        val sealedClass: SealedClass = SealedClass.Test("value")
        val abstractClass: AbstractClass = ImplementedClass("value", true)
        val nestedClass = NestedClass(testData, sealedClass, abstractClass, listOf(), listOf(), listOf(), mapOf(), mapOf(), mapOf())
        val encoded = encode(NestedClass.serializer(), nestedClass) {
            encodeDefaults = true
            serializersModule = module
        }

        val testDataEncoded = nativeMapOf("map" to nativeMapOf(), "otherMap" to nativeMapOf(), "bool" to true, "nullableBool" to null, "valueClass" to 42)
        val sealedEncoded = nativeMapOf("type" to "test", "value" to "value")
        val abstractEncoded = nativeMapOf("type" to "implemented", "abstractValue" to "value", "otherValue" to true)
        nativeAssertEquals(
            nativeMapOf(
                "testData" to testDataEncoded,
                "sealed" to sealedEncoded,
                "abstract" to abstractEncoded,
                "testDataList" to nativeListOf(),
                "sealedList" to nativeListOf(),
                "abstractList" to nativeListOf(),
                "testDataMap" to nativeMapOf(),
                "sealedMap" to nativeMapOf(),
                "abstractMap" to nativeMapOf(),
            ),
            encoded,
        )

        val decoded = decode(NestedClass.serializer(), encoded) {
            serializersModule = module
        }
        assertEquals(nestedClass, decoded)
    }

This code fails on JS due to a wrong implementation of the List Serializer.

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