Check both the types of old and new values. Fixes #8

index.js

@@ -22,7 +22,7 @@ var comparing = [];
 function compare(path, old, new_) {
   var changes = [];
   if (old !== null && new_ !== null &&
-      typeof old === 'object' &&
+      typeof old === 'object' && typeof new_ === 'object' &&
       !_.contains(comparing, old)) {
 
     comparing.push(old);

test/index.js

@@ -243,4 +243,12 @@ describe('changeset', function () {
     ]);
     done();
   });
+
+  it('should be able to diff from an object to a basic type', function() {
+    var a = {hello: {nested: 2}};
+    var b = {hello: 3};
+    var changeset = diff(a, b);
+    var b_ = diff.apply(changeset, a);
+    expect(b).to.deep.equals(b_);
+  });
 });