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kotlinlang

The following test is failing for me on Native. It throws a `NullPointerException` inside the `unmap()` call. Is this a limitation of the use of `Mapper` on native or am I doing something wrong?
```
@Test fun mapCoders() {
    val foo = Foo("hello", 43110)
    val mapper = Mapper.default

    val map = mapper.map(Foo.serializer(), foo)
    assertEquals("hello", map["bar"])
    assertEquals(43110, map["baz"])

    val newFoo = mapper.unmap(Foo.serializer(), map)
    assertEquals(foo, newFoo)
}

@Serializable
data class Foo(val bar: String, val baz: Int)
```

Untitled

`Mapper` isn't supported now for Kotlin/Native :disappointed: