Make sure references to penguin object are expunged by gc

houdini/cooldown.py

@@ -67,7 +67,7 @@ class _CooldownMapping:
 
     def _get_bucket_key(self, p):
         if self._cooldown.bucket_type == BucketType.Default:
-            return p
+            return p.id
         return p.server
 
     def _verify_cache_integrity(self):

houdini/data/room.py

@@ -96,6 +96,8 @@ class PenguinBackyardRoom(RoomMixin):
         await p.send_xt('jr', self.id, await p.string)
 
     async def remove_penguin(self, p):
+        self.penguin = None
+
         p.room = None
         p.frame = 1
         p.toy = None