diff --git a/reflections/shape/shape-test.js b/reflections/shape/shape-test.js
index 7ead2ca..0ba54fe 100644
--- a/reflections/shape/shape-test.js
+++ b/reflections/shape/shape-test.js
@@ -711,6 +711,41 @@ QUnit.test("assignDeepList", function(){
 	], "assigned right");
 });
 
+QUnit.test("assignDeep copy #150", function() {
+	var obj = {};
+	var objMap = {prop: { foo: 'bar' }};
+	getSetReflections.setKeyValue(objMap.prop,canSymbol.for("can.onValue"), function(){});
+	shapeReflections.assignDeep(obj, objMap);
+	QUnit.notEqual(obj.prop, objMap.prop, "copy without referencing");
+});
+
+QUnit.test("assign-deep with a constructor #150", function() {
+	var Example = {};
+	getSetReflections.setKeyValue(Example,canSymbol.for("can.new"), function(){
+		return this;
+	});
+
+	var objMap = {};
+
+	shapeReflections.assignDeep(objMap, {nested: Example});
+	ok(objMap.nested === Example);
+});
+
+QUnit.test("assign-deep with duplicate objects #150", function() {
+	var me = {
+		name: "Justin"
+	};
+
+	var references = {
+		husband: me,
+		friend: me
+	};
+	
+	var ref = {};
+	shapeReflections.assignDeep(ref, references);
+	ok(ref.husband === ref.friend, "multiple properties point to the same thing");
+});
+
 
 /*QUnit.test("getAllEnumerableKeys", function(){
 
diff --git a/reflections/shape/shape.js b/reflections/shape/shape.js
index 17235fc..88ac4af 100644
--- a/reflections/shape/shape.js
+++ b/reflections/shape/shape.js
@@ -813,18 +813,29 @@ shapeReflections = {
 		return target;
 	},
 	assignDeepMap: function(target, source) {
-
+		
 		var hasOwnKey = fastHasOwnKey(target);
 		var getKeyValue = target[getKeyValueSymbol] || shiftedGetKeyValue;
 		var setKeyValue = target[setKeyValueSymbol] || shiftedSetKeyValue;
+		var serialized = new Map();
+		var serializedNewVal;
 
 		shapeReflections.eachKey(source, function(newVal, key){
 			if(!hasOwnKey(key)) {
-				// set no matter what
-				getSetReflections.setKeyValue(target, key, newVal);
+				if (newVal && (typeReflections.isConstructorLike(newVal) || typeReflections.isPrimitive(newVal) || typeReflections.isPlainObject(newVal) === false)) {
+					// set no matter what
+					getSetReflections.setKeyValue(target, key, newVal);
+				} else {
+					serializedNewVal = serialized.get(newVal);
+					if (!serializedNewVal) {
+						serializedNewVal = shapeReflections.serialize(newVal);
+						serialized.set(newVal, serializedNewVal);
+					}
+					setKeyValue.call(target, key, serializedNewVal);
+				}
 			} else {
 				var curVal = getKeyValue.call(target, key);
-
+	
 				// if either was primitive, no recursive update possible
 				if(newVal === curVal) {
 					// do nothing