diff --git a/wp-includes/js/customize-base.js b/wp-includes/js/customize-base.js
index db573b5fca..ec7ca172be 100644
--- a/wp-includes/js/customize-base.js
+++ b/wp-includes/js/customize-base.js
@@ -176,7 +176,7 @@ window.wp = window.wp || {};
 			to = this.validate( to );
 
 			// Bail if the sanitized value is null or unchanged.
-			if ( null === to || this._value === to )
+			if ( null === to || this.isEqual( to ) )
 				return this;
 
 			this._value = to;
@@ -251,7 +251,78 @@ window.wp = window.wp || {};
 				this.unlink( that );
 			});
 			return this;
+		},
+
+		isEqual: function( to ) {
+			return this._eq( this._value, to, [], [] );
+		},
+
+		/**
+		 * Internal recursive comparison function for `isEqual`.
+		 * Copied from Underscore.js.
+		 */
+		/* jshint ignore:start */
+		_eq: function(a, b, aStack, bStack) {
+			if (a === b) return a !== 0 || 1 / a == 1 / b;
+			if (a == null || b == null) return a === b;
+
+			var className = toString.call(a);
+			if (className != toString.call(b)) return false;
+			switch (className) {
+				case '[object String]':
+					return a == String(b);
+				case '[object Number]':
+					return a != +a ? b != +b : (a == 0 ? 1 / a == 1 / b : a == +b);
+				case '[object Date]':
+				case '[object Boolean]':
+					return +a == +b;
+				case '[object RegExp]':
+					return a.source == b.source &&
+								a.global == b.global &&
+								a.multiline == b.multiline &&
+								a.ignoreCase == b.ignoreCase;
+			}
+			if (typeof a != 'object' || typeof b != 'object') return false;
+			var length = aStack.length;
+			while (length--) {
+				if (aStack[length] == a) return bStack[length] == b;
+			}
+			var aCtor = a.constructor, bCtor = b.constructor;
+			if (aCtor !== bCtor && !((typeof aCtor === 'function') && (aCtor instanceof aCtor) &&
+									(typeof bCtor === 'function') && (bCtor instanceof bCtor))) {
+				return false;
+			}
+			aStack.push(a);
+			bStack.push(b);
+			var size = 0, result = true;
+
+			if (className == '[object Array]') {
+				size = a.length;
+				result = size == b.length;
+				if (result) {
+					while (size--) {
+						if (!(result = this._eq(a[size], b[size], aStack, bStack))) break;
+					}
+				}
+			} else {
+				for (var key in a) {
+					if (hasOwnProperty.call(a, key)) {
+						size++;
+						if (!(result = hasOwnProperty.call(b, key) && this._eq(a[key], b[key], aStack, bStack))) break;
+					}
+				}
+				if (result) {
+					for (key in b) {
+						if (hasOwnProperty.call(b, key) && !(size--)) break;
+					}
+					result = !size;
+				}
+			}
+			aStack.pop();
+			bStack.pop();
+			return result;
 		}
+		/* jshint ignore:end */
 	});
 
 	/* =====================================================================
diff --git a/wp-includes/js/customize-base.min.js b/wp-includes/js/customize-base.min.js
index c31a38b99a..b0dfe96bc0 100644
--- a/wp-includes/js/customize-base.min.js
+++ b/wp-includes/js/customize-base.min.js
@@ -1 +1 @@
-window.wp=window.wp||{},function(a,b){var c,d,e,f,g=Array.prototype.slice;d=function(a,b){var c=f(this,a,b);return c.extend=this.extend,c},e=function(){},f=function(a,c,d){var f;return f=c&&c.hasOwnProperty("constructor")?c.constructor:function(){var b=a.apply(this,arguments);return b},b.extend(f,a),e.prototype=a.prototype,f.prototype=new e,c&&b.extend(f.prototype,c),d&&b.extend(f,d),f.prototype.constructor=f,f.__super__=a.prototype,f},c={},c.Class=function(a,d,e){var f,g=arguments;return a&&d&&c.Class.applicator===a&&(g=d,b.extend(this,e||{})),f=this,this.instance&&(f=function(){return f.instance.apply(f,arguments)},b.extend(f,this)),f.initialize.apply(f,g),f},c.Class.applicator={},c.Class.prototype.initialize=function(){},c.Class.prototype.extended=function(a){for(var b=this;"undefined"!=typeof b.constructor;){if(b.constructor===a)return!0;if("undefined"==typeof b.constructor.__super__)return!1;b=b.constructor.__super__}return!1},c.Class.extend=d,c.Events={trigger:function(a){return 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b(a,this.element)},refresh:function(){},update:function(){}}),c.Element.synchronizer={},b.each(["html","val"],function(a,b){c.Element.synchronizer[b]={update:function(a){this.element[b](a)},refresh:function(){return this.element[b]()}}}),c.Element.synchronizer.checkbox={update:function(a){this.element.prop("checked",a)},refresh:function(){return this.element.prop("checked")}},c.Element.synchronizer.radio={update:function(a){this.element.filter(function(){return this.value===a}).prop("checked",!0)},refresh:function(){return this.element.filter(":checked").val()}},b.support.postMessage=!!window.postMessage,c.Messenger=c.Class.extend({add:function(a,b,d){return this[a]=new c.Value(b,d)},initialize:function(a,c){var d=window.parent==window?null:window.parent;b.extend(this,c||{}),this.add("channel",a.channel),this.add("url",a.url||""),this.add("targetWindow",a.targetWindow||d),this.add("origin",this.url()).link(this.url).setter(function(a){return a.replace(/([^:]+:\/\/[^\/]+).*/,"$1")}),this.receive=b.proxy(this.receive,this),this.receive.guid=b.guid++,b(window).on("message",this.receive)},destroy:function(){b(window).off("message",this.receive)},receive:function(a){var b;a=a.originalEvent,this.targetWindow()&&(this.origin()&&a.origin!==this.origin()||"string"==typeof a.data&&"{"===a.data[0]&&(b=JSON.parse(a.data),b&&b.id&&"undefined"!=typeof b.data&&(!b.channel&&!this.channel()||this.channel()===b.channel)&&this.trigger(b.id,b.data)))},send:function(a,b){var c;b="undefined"==typeof b?null:b,this.url()&&this.targetWindow()&&(c={id:a,data:b},this.channel()&&(c.channel=this.channel()),this.targetWindow().postMessage(JSON.stringify(c),this.origin()))}}),b.extend(c.Messenger.prototype,c.Events),c=b.extend(new c.Values,c),c.get=function(){var a={};return this.each(function(b,c){a[c]=b.get()}),a},a.customize=c}(wp,jQuery);
\ No newline at end of file
+window.wp=window.wp||{},function(a,b){var c,d,e,f,g=Array.prototype.slice;d=function(a,b){var c=f(this,a,b);return c.extend=this.extend,c},e=function(){},f=function(a,c,d){var f;return f=c&&c.hasOwnProperty("constructor")?c.constructor:function(){var b=a.apply(this,arguments);return b},b.extend(f,a),e.prototype=a.prototype,f.prototype=new e,c&&b.extend(f.prototype,c),d&&b.extend(f,d),f.prototype.constructor=f,f.__super__=a.prototype,f},c={},c.Class=function(a,d,e){var f,g=arguments;return a&&d&&c.Class.applicator===a&&(g=d,b.extend(this,e||{})),f=this,this.instance&&(f=function(){return f.instance.apply(f,arguments)},b.extend(f,this)),f.initialize.apply(f,g),f},c.Class.applicator={},c.Class.prototype.initialize=function(){},c.Class.prototype.extended=function(a){for(var b=this;"undefined"!=typeof b.constructor;){if(b.constructor===a)return!0;if("undefined"==typeof b.constructor.__super__)return!1;b=b.constructor.__super__}return!1},c.Class.extend=d,c.Events={trigger:function(a){return 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\ No newline at end of file