From 1fb0f6c57fd82b99955b5909714d569f2c377c0b Mon Sep 17 00:00:00 2001
From: Kurakin Alexander <kuraga333@mail.ru>
Date: Sat, 19 Dec 2015 19:47:05 +0300
Subject: [PATCH] Fix updating to null and to undefined

---
 src/mixins.js         |  2 +-
 tests/freezer-spec.js | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/src/mixins.js b/src/mixins.js
index cdd9018..5c96db1 100644
--- a/src/mixins.js
+++ b/src/mixins.js
@@ -37,7 +37,7 @@ var commonMethods = {
 
 		if( !update ){
 			for( var key in attrs ){
-				update = update || this[ key ] != attrs[ key ];
+				update = update || this[ key ] !== attrs[ key ];
 			}
 
 			// No changes, just return the node
diff --git a/tests/freezer-spec.js b/tests/freezer-spec.js
index bd10b9e..ea32785 100644
--- a/tests/freezer-spec.js
+++ b/tests/freezer-spec.js
@@ -123,6 +123,38 @@ describe("Freezer test", function(){
 		assert.notEqual( updated, data );
 	});
 
+	it( "Update a value to null", function(){
+		data.set('a', null);
+
+		var updated = freezer.getData();
+
+		assert.deepEqual( updated.a, null );
+
+		assert.notEqual( updated, data );
+	});
+
+	it( "Update an undefined value to null", function(){
+		data = data.set('a', undefined);
+		data.set('a', null);
+
+		var updated = freezer.getData();
+
+		assert.strictEqual( updated.a, null );
+
+		assert.notEqual( updated, data );
+	});
+
+	it( "Update an null value to undefined", function(){
+		data = data.set('a', null);
+		data.set('a', undefined);
+
+		var updated = freezer.getData();
+
+		assert.strictEqual( updated.a, undefined );
+
+		assert.notEqual( updated, data );
+	});
+
 	it( "Update a value doesnt modify other elements", function(){
 		data.set({a: 2});