Some syntax + comment updates

Author: wyattjoh

lib/redis-store.js

@@ -22,12 +22,15 @@ var RedisStore = function(options) {
           return cb(err);
         }
 
-        //in ioredis, every reply consists of an array [err, value]. We don't need the error here.
-        //if we aren't dealing with an array, nothing is changed
-        replies.map(function(val, index) {
-          if (typeof val === 'object' && val.constructor === Array) {
-            replies[index] = val[1];
+        // in ioredis, every reply consists of an array [err, value].
+        // We don't need the error here, and if we aren't dealing with an array,
+        // nothing is changed.
+        replies = replies.map(function(val, index) {
+          if (Array.isArray(val) && val.length >= 2) {
+            return val[1];
           }
+
+          return val;
         });
 
         // if this is new or has no expiry