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kotlinlang

Hi, I have an issue with Jackson, Spring Boot and Kotlin 1.5 when using _value classes_. The converted json key includes the “special” class name suffix generated by the kotlin compiler for value classes.

E.g. for
```data class Resource(
    val fooInterval: Milliseconds,
    val barInterval: Milliseconds?,
    …
)
@JvmInline
value class Milliseconds(val units: Int)```
The generated json for `fooInterval` becomes
```"fooInterval-kqdxTu8": 900,```
And for the nullable property it becomes
```"barInterval-OO-hnm0": {
        "units": 900
}```
The suffix comes from the generated type (value class) but It looks like a bug that it is used as part of the parameter name.

Any thoughts?

It seems to be work with `com.fasterxml.jackson.module:jackson-module-kotlin:2.12.3`

Not quite fixed it seems. If it’s nullable it’s still wrapped. I’ll try to write custom serializers.

Fixed this by using
```@JvmInline
value class Milliseconds @JsonCreator constructor(@JsonValue val units: Int)```

Ah, you added `@JsonCreator` and `@JsonValue`?