diff --git a/core/event/event-manager.js b/core/event/event-manager.js
index 17ccba4a43..bd24c07446 100644
--- a/core/event/event-manager.js
+++ b/core/event/event-manager.js
@@ -1485,12 +1485,12 @@ var EventManager = exports.EventManager = Montage.specialize(/** @lends EventMan
     methodNameForBubblePhaseOfEventType: {
         enumerable: false,
         value: function methodNameForBubblePhaseOfEventType(eventType, identifier, capitalizedEventType, capitalizedIdentifier) {
-            var eventTypeBucket;
+            var eventTypeBucket, eventTypeString = String(eventType);
             if (identifier) {
-                eventTypeBucket = this._bubbleMethodNameByEventTypeIdentifier_.get(eventType) || (this._bubbleMethodNameByEventTypeIdentifier_.set(eventType, new Map())).get(eventType);
-                return eventTypeBucket.get(identifier) || (eventTypeBucket.set(identifier, ("handle" + (capitalizedIdentifier || identifier.toCapitalized()) + (capitalizedEventType || eventType.toCapitalized())))).get(identifier);
+                eventTypeBucket = this._bubbleMethodNameByEventTypeIdentifier_.get(eventTypeString) || (this._bubbleMethodNameByEventTypeIdentifier_.set(eventTypeString, new Map())).get(eventTypeString);
+                return eventTypeBucket.get(identifier) || (eventTypeBucket.set(identifier, ("handle" + (capitalizedIdentifier || identifier.toCapitalized()) + (capitalizedEventType || eventTypeString.toCapitalized())))).get(identifier);
             } else {
-                return this._bubbleMethodNameByEventType_.get(eventType) || (this._bubbleMethodNameByEventType_.set(eventType, ("handle" + (capitalizedEventType || eventType.toCapitalized())))).get(eventType);
+                return this._bubbleMethodNameByEventType_.get(eventTypeString) || (this._bubbleMethodNameByEventType_.set(eventTypeString, ("handle" + (capitalizedEventType || eventTypeString.toCapitalized())))).get(eventTypeString);
             }
         }
     },
@@ -1508,13 +1508,13 @@ var EventManager = exports.EventManager = Montage.specialize(/** @lends EventMan
     methodNameForCapturePhaseOfEventType: {
         enumerable: false,
         value: function methodNameForCapturePhaseOfEventType(eventType, identifier, capitalizedEventType, capitalizedIdentifier) {
-            var eventTypeBucket;
+            var eventTypeBucket, eventTypeString = String(eventType);
             if (identifier) {
-                eventTypeBucket = this._catptureMethodNameByEventTypeIdentifier_.get(eventType) || (this._catptureMethodNameByEventTypeIdentifier_.set(eventType,new Map())).get(eventType);
-                return eventTypeBucket.get(identifier) || (eventTypeBucket.set(identifier,("capture" + (capitalizedIdentifier || identifier.toCapitalized()) + (capitalizedEventType || eventType.toCapitalized())))).get(identifier);
+                eventTypeBucket = this._catptureMethodNameByEventTypeIdentifier_.get(eventTypeString) || (this._catptureMethodNameByEventTypeIdentifier_.set(eventTypeString,new Map())).get(eventTypeString);
+                return eventTypeBucket.get(identifier) || (eventTypeBucket.set(identifier,("capture" + (capitalizedIdentifier || identifier.toCapitalized()) + (capitalizedEventType || eventTypeString.toCapitalized())))).get(identifier);
             } else {
-                return this._captureMethodNameByEventType_.get(eventType) ||
-                    (this._captureMethodNameByEventType_.set(eventType, ("capture" + (capitalizedEventType || eventType.toCapitalized())))).get(eventType);
+                return this._captureMethodNameByEventType_.get(eventTypeString) ||
+                    (this._captureMethodNameByEventType_.set(eventTypeString, ("capture" + (capitalizedEventType || eventTypeString.toCapitalized())))).get(eventTypeString);
             }
         }
     },
@@ -2822,7 +2822,7 @@ var EventManager = exports.EventManager = Montage.specialize(/** @lends EventMan
 
             var targetCandidate = target,
                 application = this.application,
-                eventPath = [],
+                eventPath,
                 discoveredTargets = this._eventPathForTargetMap;
 
             discoveredTargets.clear();
@@ -2832,7 +2832,7 @@ var EventManager = exports.EventManager = Montage.specialize(/** @lends EventMan
 
             do {
                 if (!discoveredTargets.has(targetCandidate)) {
-                    eventPath.push(targetCandidate);
+                    (eventPath || (eventPath = [])).push(targetCandidate);
                     discoveredTargets.set(targetCandidate,true);
                 }
 
diff --git a/core/event/mutable-event.js b/core/event/mutable-event.js
index ef6a5da322..268f425b07 100644
--- a/core/event/mutable-event.js
+++ b/core/event/mutable-event.js
@@ -34,6 +34,12 @@ if (typeof window !== "undefined") {
         @class MutableEvent
     */
     var MutableEvent = exports.MutableEvent = Montage.specialize(/** @lends MutableEvent# */ {
+        constructor: {
+            value: function() {
+                this._currentTarget = void 0;
+                return this;
+            }
+        },
 
     /**
       @private