https://kotlinlang.org/docs/native-dynamic-libraries.html#generated-headers-file there could definitely be more docs, but a non-primitive type

example.Clazz

in a library named

native

is exposed to C as a

typedef struct {
  libnative_KNativePtr pinned;
} libnative_kref_example_Clazz;

this applies to

kotlin.Array

as well, which becomes

typedef struct { libnative_KNativePtr pinned; } libnative_kref_kotlin_Array