Changing logic of Arcadia.Utils/TrueNil. Fixes #351.

Helpers/Util.cs

@@ -368,11 +368,10 @@ public static bool IsNull (object obj)
 		public static object TrueNil (object obj)
 		{
 			UnityEngine.Object obj2 = obj as UnityEngine.Object;
-			if (obj2 == null) {
+			if (obj2 == null && obj is UnityEngine.Object) {
 				return null;
 			}
-
-			return obj;
+			return obj;	
 		}
 
 		// ==================================================================

Tests/arcadia/arcadia_tests.clj

@@ -201,6 +201,7 @@
 
 ;; ------------------------------------------------------------
 
+
 (at/deftest scene-graph-system t
   (as-sub-closing [t "GameObject traversal"]
     (with-temp-objects :lit [x y z]
@@ -568,6 +569,17 @@
 ;; core-namespace
 
 (at/deftest core-namespace t
+  (as-sub-closing [t "null->nil"]
+    (with-temp-objects :lit [obj]
+      (t (at/is (= obj (ac/null->nil obj))
+           "non-destroyed object null->nil value is original object")))
+    (with-temp-objects :lit [obj]
+      (ac/destroy-immediate obj)
+      (t (at/is (= nil (ac/null->nil obj))
+           "destroyed object null->nil value is nil")))
+    (t
+      (at/is (= :not-a-unity-object (ac/null->nil :not-a-unity-object)))
+      (at/is (= nil (ac/null->nil nil)))))
   (as-sub-closing [t "instantiate"]
     (with-temp-objects :lit [original]
       (let [position (al/v3 (rand) (rand) (rand))
@@ -592,7 +604,10 @@
                   "3-ary instantiate uses new position"))
         (t (at/is (= (.. clone-2 transform rotation)
                      rotation)
-                  "3-ary instantiate uses new rotation"))))))
+             "3-ary instantiate uses new rotation"))))))
+
+;; ------------------------------------------------------------
+
 
 ;; ------------------------------------------------------------
 ;; linear-namespace