Use call instead of apply for cached results.

lib/caching.js

@@ -39,7 +39,7 @@ var caching = function (args) {
             if (err && (!self.ignoreCacheErrors)) {
                 cb(err);
             } else if (result) {
-                cb.apply(null, result);
+                cb.call(cb, null, result);
             } else if (self.queues[key]) {
                 self.queues[key].push(cb);
             } else {
@@ -50,7 +50,8 @@ var caching = function (args) {
                     if (work_args[0]) { // assume first arg is an error
                         return cb(work_args[0]);
                     }
-                    self.store.set(key, work_args, function (err) {
+                    // Subsequently assume second arg is result.
+                    self.store.set(key, work_args[1], function (err) {
                         if (err && (!self.ignoreCacheErrors)) {
                             return cb(err);
                         }