Cast id to string before creation, fix #145

lib/adapters/redis2.js

@@ -268,10 +268,10 @@ BridgeToRedis.prototype.create = function (model, data, callback) {
     }.bind(this));
 
     function create(id, upsert) {
-        data.id = id;
+        data.id = id.toString();
         this.save(model, data, function (err) {
             if (callback) {
-                callback(err, id);
+                callback(err, parseInt(id, 10));
             }
         });