gistfile1.diff

diff --git a/vumi/persist/txredis_manager.py b/vumi/persist/txredis_manager.py
index f4ba173..9cacc95 100644
--- a/vumi/persist/txredis_manager.py
+++ b/vumi/persist/txredis_manager.py
@@ -87,6 +87,14 @@ class VumiRedis(txr.Redis):
                                              withscores=withscores,
                                              reverse=desc)
 
+    def zrangebyscore(self, name, min, max, start=None, num=None,
+                      withscores=False, score_cast_func=float):
+        d = super(VumiRedis, self).zrangebyscore(
+            key, min, max, offset=start, count=num, withscores=withscores)
+        if withscores:
+            d.addCallback(lambda r: [(v, score_cast_func(s)) for v, s in r])
+        return d
+
 
 class VumiRedisClientFactory(txr.RedisClientFactory):
     protocol = VumiRedis