diff --git a/src/micro/attributes.html b/src/micro/attributes.html
index 3a5a4b1f61..73eadb16e0 100644
--- a/src/micro/attributes.html
+++ b/src/micro/attributes.html
@@ -60,18 +60,19 @@
 
   Polymer.Base._addFeature({
 
-    _prepAttributes: function() {
-      this._aggregatedAttributes = {};
-    },
-
     _addHostAttributes: function(attributes) {
+      if (!this._aggregatedAttributes) {
+        this._aggregatedAttributes = {};
+      }
       if (attributes) {
         this.mixin(this._aggregatedAttributes, attributes);
       }
     },
 
     _marshalHostAttributes: function() {
-      this._applyAttributes(this, this._aggregatedAttributes);
+      if (this._aggregatedAttributes) {
+        this._applyAttributes(this, this._aggregatedAttributes);
+      }
     },
 
     /* apply attributes to node but avoid overriding existing values */
@@ -83,8 +84,9 @@
         if (!this.hasAttribute(n) && (n !== 'class')) {
           var v = attr$[n];
           this.serializeValueToAttribute(v, n, this);
+          // TODO(sorvell): this should not be in micro layer.
           // if necessary, add this value to configuration...
-          if (!this._clientsReady && this._propertyInfo[n] &&
+          if (!this._clientsReadied && this._propertyInfo[n] &&
             (this._config[n] === undefined)) {
             this._config[n] = v;
           }
@@ -161,9 +163,12 @@
       //   this._warn(this._logf('serializeValueToAttribute',
       //     'serializing long attribute values can lead to poor performance', this));
       // }
-      (node || this)
-        [str === undefined ? 'removeAttribute' : 'setAttribute']
-          (attribute, str);
+      node = node || this;
+      if (str === undefined) {
+        node.removeAttribute(attribute);
+      } else {
+        node.setAttribute(attribute, str);
+      }
     },
 
     /**
diff --git a/src/micro/behaviors.html b/src/micro/behaviors.html
index ca5ca85354..160df13579 100644
--- a/src/micro/behaviors.html
+++ b/src/micro/behaviors.html
@@ -79,7 +79,8 @@
 
     _flattenBehaviorsList: function(behaviors) {
       var flat = [];
-      behaviors.forEach(function(b) {
+      for (var i=0; i < behaviors.length; i++) {
+        var b = behaviors[i];
         if (b instanceof Array) {
           flat = flat.concat(this._flattenBehaviorsList(b));
         }
@@ -89,32 +90,17 @@
         } else {
           this._warn(this._logf('_flattenBehaviorsList', 'behavior is null, check for missing or 404 import'));
         }
-      }, this);
+      }
       return flat;
     },
 
     _mixinBehavior: function(b) {
-      Object.getOwnPropertyNames(b).forEach(function(n) {
-        switch (n) {
-          case 'hostAttributes':
-          case 'registered':
-          case 'properties':
-          case 'observers':
-          case 'listeners':
-          case 'created':
-          case 'attached':
-          case 'detached':
-          case 'attributeChanged':
-          case 'configure':
-          case 'ready':
-            break;
-          default:
-            if (!this.hasOwnProperty(n)) {
-              this.copyOwnProperty(n, b, this);
-            }
-            break;
+      var n$ = Object.getOwnPropertyNames(b);
+      for (var i=0, n; (i<n$.length) && (n=n$[i]); i++) {
+        if (!Polymer.Base._behaviorMethods[n] && !this.hasOwnProperty(n)) {
+          this.copyOwnProperty(n, b, this);
         }
-      }, this);
+      }
     },
 
     _prepBehaviors: function() {
@@ -155,4 +141,17 @@
 
   });
 
+  Polymer.Base._behaviorMethods = {
+    hostAttributes: true,
+    registered: true,
+    properties: true,
+    observers: true,
+    listeners: true,
+    created: true,
+    attached: true,
+    detached: true,
+    attributeChanged: true,
+    ready: true
+  }
+
 </script>
diff --git a/src/micro/properties.html b/src/micro/properties.html
index 92156c32bd..2b4633a539 100644
--- a/src/micro/properties.html
+++ b/src/micro/properties.html
@@ -108,9 +108,12 @@
     getPropertyInfo: function(property) {
       var info = this._getPropertyInfo(property, this.properties);
       if (!info) {
-        this.behaviors.some(function(b) {
-          return info = this._getPropertyInfo(property, b.properties);
-        }, this);
+        for (var i=0; i < this.behaviors.length; i++) {
+          info = this._getPropertyInfo(property, this.behaviors[i].properties);
+          if (info) {
+            return info;
+          }
+        };
       }
       return info || Polymer.nob;
     },
diff --git a/src/standard/x-styling.html b/src/standard/x-styling.html
index 2975eeb99e..aeb6543f59 100644
--- a/src/standard/x-styling.html
+++ b/src/standard/x-styling.html
@@ -31,7 +31,7 @@
         // if it has any _stylePropertyNames
         this._ownStylePropertyNames = this._styles ?
           propertyUtils.decorateStyles(this._styles) :
-          [];
+          null;
       },
 
       /**
@@ -40,7 +40,7 @@
        * (analogous to setting `style`) and then calling `updateStyles()`.
        *
        */
-      customStyle: {},
+      customStyle: null,
 
       // here we have an instance time spot to put custom property data
       _setupStyleProperties: function() {