To improve uses of the collection in mixed feature, the SDKs would like to receive key path information about the exact changes, when receiving notifications about changes inside a mixed field or hierarchy of such.

The key-path information could be expressed in a format similar to the representation in https://github.com/realm/realm-core/blob/next-major/src/realm/path.hpp

If the same exact key-path information could be provided for normal object notifications in the same go, then it is a plus, but not a requirement for this task.

Original request popped out of SDK discussions in: https://docs.google.com/document/d/1bn4hsdJulc34Ll9KDNG3_nWXLF8CzheXU3x6ZxxAagw/edit#heading=h.j8cg1emgd52y

final subscription = obj.changes.listen((event) {
  console.log(event);
});

realm.write(() {
  obj.mixed.asList.add(RealmValue.bool(true)); 
}); 

realm.write(() {
  obj.mixed.asList()[1].asMap()['list'] = RealmValue.from([10]);
});

// logged: 'mixed', 'mixed' - should we include keypath info, otherwise
// it's quite useless for fine-grained updates