Fix a problem that happens when you try to store real binary data ins…

…tead of JSONs.

src/Redis/Orleans.Persistence.Redis/Storage/RedisGrainStorage.cs

@@ -166,7 +166,7 @@ public async Task WriteStateAsync<T>(string grainType, GrainId grainId, IGrainSt
 
             try
             {
-                var payload = new RedisValue(_grainStorageSerializer.Serialize<T>(grainState.State).ToString());
+                RedisValue payload = _grainStorageSerializer.Serialize<T>(grainState.State).ToMemory();
                 var keys = new RedisKey[] { key };
                 var args = new RedisValue[] { etag, newEtag, payload, _ttl };
                 var response = await _db.ScriptEvaluateAsync(WriteScript, keys, args).ConfigureAwait(false);