diff --git a/src/as/com/threerings/presents/dobj/AttributeChangedEvent.as b/src/as/com/threerings/presents/dobj/AttributeChangedEvent.as
index 77c93e262..970752eec 100644
--- a/src/as/com/threerings/presents/dobj/AttributeChangedEvent.as
+++ b/src/as/com/threerings/presents/dobj/AttributeChangedEvent.as
@@ -90,8 +90,12 @@ public class AttributeChangedEvent extends NamedEvent
             oldValue :Object = null)
     {
         super(targetOid, name);
-        _value = value;
-        _oldValue = oldValue;
+
+        // only init these values if they were specified
+        if (arguments.length > 0) {
+            _value = value;
+            _oldValue = oldValue;
+        }
     }
 
     // documentation inherited
diff --git a/src/as/com/threerings/presents/dobj/ElementUpdatedEvent.as b/src/as/com/threerings/presents/dobj/ElementUpdatedEvent.as
index 96d162814..20b4c91a6 100644
--- a/src/as/com/threerings/presents/dobj/ElementUpdatedEvent.as
+++ b/src/as/com/threerings/presents/dobj/ElementUpdatedEvent.as
@@ -56,11 +56,13 @@ public class ElementUpdatedEvent extends NamedEvent
             oldValue :Object = null, index :int = 0)
     {
         super(targetOid, name);
-        _value = value;
-        if (oldValue != null) {
+
+        // only init these values if they were specified
+        if (arguments.length > 0) {
+            _value = value;
             _oldValue = oldValue;
+            _index = index;
         }
-        _index = index;
     }
 
     /**
diff --git a/src/as/com/threerings/presents/dobj/EntryAddedEvent.as b/src/as/com/threerings/presents/dobj/EntryAddedEvent.as
index f60178749..76b60c7bf 100644
--- a/src/as/com/threerings/presents/dobj/EntryAddedEvent.as
+++ b/src/as/com/threerings/presents/dobj/EntryAddedEvent.as
@@ -49,7 +49,11 @@ public class EntryAddedEvent extends NamedEvent
             targetOid :int = 0, name :String = null, entry :DSet_Entry = null)
     {
         super(targetOid, name);
-        _entry = entry;
+
+        // only init these values if they were specified
+        if (arguments.length > 0) {
+            _entry = entry;
+        }
     }
 
     /**
diff --git a/src/as/com/threerings/presents/dobj/EntryRemovedEvent.as b/src/as/com/threerings/presents/dobj/EntryRemovedEvent.as
index 79bf55d14..4901740be 100644
--- a/src/as/com/threerings/presents/dobj/EntryRemovedEvent.as
+++ b/src/as/com/threerings/presents/dobj/EntryRemovedEvent.as
@@ -53,8 +53,10 @@ public class EntryRemovedEvent extends NamedEvent
             oldEntry :DSet_Entry = null)
     {
         super(targetOid, name);
-        _key = key;
-        if (oldEntry != null) {
+
+        // only init these values if they were specified
+        if (arguments.length > 0) {
+            _key = key;
             _oldEntry = oldEntry;
         }
     }
diff --git a/src/as/com/threerings/presents/dobj/EntryUpdatedEvent.as b/src/as/com/threerings/presents/dobj/EntryUpdatedEvent.as
index ba799462f..b1d311342 100644
--- a/src/as/com/threerings/presents/dobj/EntryUpdatedEvent.as
+++ b/src/as/com/threerings/presents/dobj/EntryUpdatedEvent.as
@@ -51,8 +51,10 @@ public class EntryUpdatedEvent extends NamedEvent
             oldEntry :DSet_Entry = null)
     {
         super(targetOid, name);
-        _entry = entry;
-        if (oldEntry != null) {
+
+        // only init these values if they were specified
+        if (arguments.length > 0) {
+            _entry = entry;
             _oldEntry = oldEntry;
         }
     }
diff --git a/src/as/com/threerings/presents/dobj/InvocationNotificationEvent.as b/src/as/com/threerings/presents/dobj/InvocationNotificationEvent.as
index 665765b43..80b03a1b5 100644
--- a/src/as/com/threerings/presents/dobj/InvocationNotificationEvent.as
+++ b/src/as/com/threerings/presents/dobj/InvocationNotificationEvent.as
@@ -53,9 +53,13 @@ public class InvocationNotificationEvent extends DEvent
         args :Array = null)
     {
         super(targetOid);
-        _receiverId = receiverId;
-        _methodId = methodId;
-        _args = args;
+
+        // only init these values if they were specified
+        if (arguments.length > 0) {
+            _receiverId = receiverId;
+            _methodId = methodId;
+            _args = args;
+        }
     }
 
     /**
diff --git a/src/as/com/threerings/presents/dobj/InvocationRequestEvent.as b/src/as/com/threerings/presents/dobj/InvocationRequestEvent.as
index 00cac5fd5..48a0f0a89 100644
--- a/src/as/com/threerings/presents/dobj/InvocationRequestEvent.as
+++ b/src/as/com/threerings/presents/dobj/InvocationRequestEvent.as
@@ -49,9 +49,13 @@ public class InvocationRequestEvent extends DEvent
             args :Array = null)
     {
         super(targetOid);
-        _invCode = invCode;
-        _methodId = methodId;
-        _args = args;
+
+        // only init these values if they were specified
+        if (arguments.length > 0) {
+            _invCode = invCode;
+            _methodId = methodId;
+            _args = args;
+        }
     }
 
     /**
diff --git a/src/as/com/threerings/presents/dobj/InvocationResponseEvent.as b/src/as/com/threerings/presents/dobj/InvocationResponseEvent.as
index f84e1d74d..901eeead7 100644
--- a/src/as/com/threerings/presents/dobj/InvocationResponseEvent.as
+++ b/src/as/com/threerings/presents/dobj/InvocationResponseEvent.as
@@ -49,9 +49,13 @@ public class InvocationResponseEvent extends DEvent
             args :Array = null)
     {
         super(targetOid);
-        _requestId = requestId;
-        _methodId = methodId;
-        _args = args;
+
+        // only init these values if they were specified
+        if (arguments.length > 0) {
+            _requestId = requestId;
+            _methodId = methodId;
+            _args = args;
+        }
     }
 
     /**
diff --git a/src/as/com/threerings/presents/dobj/MessageEvent.as b/src/as/com/threerings/presents/dobj/MessageEvent.as
index a1b91329b..d20b42fe2 100644
--- a/src/as/com/threerings/presents/dobj/MessageEvent.as
+++ b/src/as/com/threerings/presents/dobj/MessageEvent.as
@@ -53,7 +53,11 @@ public class MessageEvent extends NamedEvent
             targetOid :int = 0, name :String = null, args :Array = null)
     {
         super(targetOid, name);
-        _args = args;
+
+        // only init these values if they were specified
+        if (arguments.length > 0) {
+            _args = args;
+        }
     }
 
     /**
diff --git a/src/as/com/threerings/presents/dobj/ObjectAddedEvent.as b/src/as/com/threerings/presents/dobj/ObjectAddedEvent.as
index 169d98689..f64cb99d9 100644
--- a/src/as/com/threerings/presents/dobj/ObjectAddedEvent.as
+++ b/src/as/com/threerings/presents/dobj/ObjectAddedEvent.as
@@ -50,7 +50,11 @@ public class ObjectAddedEvent extends NamedEvent
             targetOid :int = 0, name :String = null, oid :int = 0)
     {
         super(targetOid, name);
-        _oid = oid;
+
+        // only init these values if they were specified
+        if (arguments.length > 0) {
+            _oid = oid;
+        }
     }
 
     /**
diff --git a/src/as/com/threerings/presents/dobj/ObjectRemovedEvent.as b/src/as/com/threerings/presents/dobj/ObjectRemovedEvent.as
index a94cf6329..538aa89c0 100644
--- a/src/as/com/threerings/presents/dobj/ObjectRemovedEvent.as
+++ b/src/as/com/threerings/presents/dobj/ObjectRemovedEvent.as
@@ -52,7 +52,11 @@ public class ObjectRemovedEvent extends NamedEvent
             targetOid :int = 0, name :String = null, oid :int = 0)
     {
         super(targetOid, name);
-        _oid = oid;
+
+        // only init these values if they were specified
+        if (arguments.length > 0) {
+            _oid = oid;
+        }
     }
 
     /**
diff --git a/src/as/com/threerings/presents/dobj/OidList.as b/src/as/com/threerings/presents/dobj/OidList.as
index 30a92f818..cc3925eeb 100644
--- a/src/as/com/threerings/presents/dobj/OidList.as
+++ b/src/as/com/threerings/presents/dobj/OidList.as
@@ -104,6 +104,14 @@ public class OidList
         return _oids[index];
     }
 
+    /**
+     * Return a new array containing all the oids in this list.
+     */
+    public function toArray () :Array
+    {
+        return _oids.concat();
+    }
+
     // documentation inherited from interface Streamable
     public function writeObject (out :ObjectOutputStream) :void
     {