assembly reload preserves private fields?

Tim Cooper from Unity Technologies wrote "Private fields are serialized under some circumstances (editor)" in http://blogs.unity3d.com/2012/10/25/unity-serialization/

Does this mean that you dont need to put "[SerializeField]" onto private serializeable fields (e.g for MonoBehaviours) in the editor, to have them restored after the assembly reload deserialisation? I did not found any documentation about that.