diff --git a/externs/polymer-externs.js b/externs/polymer-externs.js
index 16fe1eaf33..a45439ae94 100644
--- a/externs/polymer-externs.js
+++ b/externs/polymer-externs.js
@@ -147,6 +147,9 @@ Polymer.legacyWarnings;
 /** @type {boolean} */
 Polymer.legacyNotifyOrder;
 
+/** @type {boolean} */
+Polymer.orderedComputed;
+
 // nb. This is explicitly 'var', as Closure Compiler checks that this is the case.
 /**
  * @constructor
diff --git a/lib/mixins/property-effects.js b/lib/mixins/property-effects.js
index 11b6ced9dc..de2d153cb4 100644
--- a/lib/mixins/property-effects.js
+++ b/lib/mixins/property-effects.js
@@ -553,9 +553,10 @@ function propertyIsDirty(inst, trigger, changedProps, hasPaths) {
         }
       }
     });
+    return false;
   } else {
-    return changedProps && trigger.rootProperty in changedProps ||
-          inst.__dataPending && trigger.rootProperty in inst.__dataPending;
+    return Boolean(changedProps && trigger.rootProperty in changedProps ||
+      inst.__dataPending && trigger.rootProperty in inst.__dataPending);
   }
 }