Instantiate does not copy variables

Questions & Answers
1

I’m having problem with instantiate. There is quite complex gameobject that I would like to copy, but now all of the variables are copied.

foreach (GameObject go in listOfPlayerDroids) {
			goCl = (GameObject) GameObject.Instantiate(go);
			goCl.tag = currentPlayer;
			goCl.layer = LayerMask.NameToLayer("Ignore Raycast");

			DroidInternalInterface aaa = goCl.GetComponent<DroidInternalInterface>();
			DroidInternalInterface aab = go.GetComponent<DroidInternalInterface>();

			foreach(Transform child in goCl.transform)
				child.gameObject.layer = LayerMask.NameToLayer("Ignore Raycast");
		}

and when I access variables from aaa and aab, they are different (set to 0 on clone).

2

Only serializable values of serialized variables are copied / saved.
See Serialization in Unity