Use deserialize from the node.

src/standard/configure.html

@@ -144,7 +144,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
                   var value = (p === x.effect.value) ? config[p] :
                     this._get(x.effect.value, config);
                   if (x.effect.kind == 'attribute') {
-                    value = this.deserialize(value,
+                    value = node.deserialize(value,
                       node._propertyInfo[name].type);
                   }
                   node._configValue(name, value);