Kotlin: Issue when mapping primitive parameters

I didn't have time to create a minimal example and compare Java/Kotlin but if you have a method like this:

Kotlin:

@Mapping(target = "nested.myFlag", source = "someFlag")
fun map(irrelevant: Source, Boolean someFlag): Target

Java:

public class Target {
  public Nested nested;
}

public class Nested {
  public Boolean myFlag;
}

Mapstruct will fail with:

Can't map parameter "boolean someFlag" to "Nested nested". Consider to declare/implement a mapping method: "Nested map(boolean value)".

1. The message isn't exactly correct, it should rather be: Can't map parameter "boolean someFlag" to "Boolean myFlag". Consider to declare/implement a mapping method: "Boolean map(boolean value)".
2. I would expect MapStruct to have no problem mapping a primitive boolean to a wrapper Boolean (might be related to Kotlin vs. Java Boolean)
3. If I'm not mistaken, this works when both booleans are in the source/target objects but not when the source boolean is a method parameter

This does not work:

fun map(boolean: Boolean): Boolean? = boolean

Workaround (nullable Boolean):

@Mapping(target = "nested.myFlag", source = "someFlag")
fun map(irrelevant: Source, Boolean? someFlag): Target

Start by reproducing the Kotlin mapper signature with a primitive Boolean parameter and compare it with the equivalent Java case described in the issue. Confirm whether the parameter is resolved to the nested Boolean target and whether the diagnostic names Boolean myFlag; done means the behavior and error message match the expected primitive-to-wrapper mapping.