From a7d9c76f5a8d95ef8be42176c6c267cbcc58da65 Mon Sep 17 00:00:00 2001
From: Cristi Scheye <cristi.scheye@gmail.com>
Date: Tue, 10 Feb 2015 17:05:50 -0800
Subject: [PATCH 1/3] use deep quality comparison for derived updates

---
 ampersand-state.js | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/ampersand-state.js b/ampersand-state.js
index 86ce52e..50ac159 100644
--- a/ampersand-state.js
+++ b/ampersand-state.js
@@ -411,8 +411,19 @@ assign(Base.prototype, BBEvents, {
                 options = options || {};
 
                 var newVal = def.fn.call(self);
+                var newValToCompare, cachedValToCompare;
 
-                if (self._cache[name] !== newVal || !def.cache) {
+                // in case the data has a toJSON val, e.g. a Model, use that for comparison
+                if (newVal.toJSON && self._cache[name].toJSON) {
+                    newValToCompare = newVal.toJSON();
+                    cachedValToCompare = self._cache[name].toJSON();
+                }
+                else {
+                    newValToCompare = newVal;
+                    cachedValToCompare = self._cache[name];
+                }
+
+                if (!_.isEqual(newValToCompare, cachedValToCompare) || !def.cache) {
                     if (def.cache) {
                         self._previousAttributes[name] = self._cache[name];
                     }

From 6226c6e7bf6321f350fbd75d8aeef30445f896b7 Mon Sep 17 00:00:00 2001
From: Cristi Scheye <cristi.scheye@gmail.com>
Date: Tue, 24 Mar 2015 14:45:30 -0700
Subject: [PATCH 2/3] using amp-is-object-equal module for comparison

---
 ampersand-state.js | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/ampersand-state.js b/ampersand-state.js
index 50ac159..4f6ec48 100644
--- a/ampersand-state.js
+++ b/ampersand-state.js
@@ -25,6 +25,7 @@ var BBEvents = require('backbone-events-standalone');
 var KeyTree = require('key-tree-store');
 var arrayNext = require('array-next');
 var changeRE = /^change:/;
+var isObjectEqual = require('amp-is-object-equal');
 
 function Base(attrs, options) {
     options || (options = {});
@@ -410,20 +411,11 @@ assign(Base.prototype, BBEvents, {
             var update = function (options) {
                 options = options || {};
 
-                var newVal = def.fn.call(self);
-                var newValToCompare, cachedValToCompare;
 
-                // in case the data has a toJSON val, e.g. a Model, use that for comparison
-                if (newVal.toJSON && self._cache[name].toJSON) {
-                    newValToCompare = newVal.toJSON();
-                    cachedValToCompare = self._cache[name].toJSON();
-                }
-                else {
-                    newValToCompare = newVal;
-                    cachedValToCompare = self._cache[name];
-                }
 
-                if (!_.isEqual(newValToCompare, cachedValToCompare) || !def.cache) {
+                var newVal = def.fn.call(self);
+
+                if (!isObjectEqual(self._cache[name], newVal) || !def.cache) {
                     if (def.cache) {
                         self._previousAttributes[name] = self._cache[name];
                     }

From eb47ccb343fd031e04543c05df8cbf66580750c3 Mon Sep 17 00:00:00 2001
From: Cristi Scheye <cristi.scheye@gmail.com>
Date: Tue, 24 Mar 2015 15:26:57 -0700
Subject: [PATCH 3/3] adding module to package.json

---
 package.json | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package.json b/package.json
index 76feb90..52dd355 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,7 @@
   },
   "dependencies": {
     "ampersand-version": "^1.0.0",
+    "amp-is-object-equal": "^1.0.2",
     "array-next": "~0.0.1",
     "backbone-events-standalone": "0.2.2",
     "key-tree-store": "~0.1.0",