Using isThang instead of instanceof Thang.

app/lib/world/thang.coffee

@@ -23,7 +23,7 @@ module.exports = class Thang
     name
 
   @resetThangIDs: -> Thang.remainingThangNames = {}
-
+  isThang: true
   apiProperties: ['id', 'spriteName', 'health', 'pos', 'team']
 
   constructor: (@world, @spriteName, @id) ->

app/lib/world/world_script_note.coffee

@@ -18,11 +18,11 @@ module.exports = class WorldScriptNote
   serialize: ->
     o = {channel: @channel, event: {}}
     for key, value of @event
-      if value instanceof Thang
+      if value?.isThang
         value = {isThang: true, id: value.id}
       else if _.isArray value
         for subval, i in value
-          if subval instanceof Thang
+          if subval?.isThang
             value[i] = {isThang: true, id: subval.id}
       o.event[key] = value
     o

app/lib/world/world_utils.coffee

@@ -39,9 +39,7 @@ module.exports.clone = clone = (obj, skipThangs=false) ->
   if (obj instanceof Vector) or (obj instanceof Rectangle)
     return obj.copy()
 
-  # We don't have Thang class here, but we can fake it to avoid the circular import
-  #if skipThangs and obj instanceof Thang
-  if skipThangs and obj.id? and obj.trackedPropertiesKeys?
+  if skipThangs and obj.isThang
     return obj
 
   if ArrayBufferView and obj instanceof ArrayBufferView

bower.json

@@ -32,7 +32,7 @@
     "firepad": "~0.1.2",
     "marked": "~0.3.0",
     "moment": "~2.5.0",
-    "aether": "~0.1.9",
+    "aether": "~0.1.10",
     "underscore.string": "~2.3.3",
     "firebase": "~1.0.2",
     "catiline": "~2.9.3"