better solution for #21. Thanks @aletorrado

lib/caching.js

@@ -50,13 +50,13 @@ var caching = function(args) {
         self.queues[key] = [{cb: cb, domain: process.domain}];
 
         function fillCallbacks(err, data) {
-            self.queues[key].forEach(function(task) {
+            var waiting = self.queues[key];
-                process.nextTick(function() {
+            delete self.queues[key];
+
+            waiting.forEach(function(task) {
                 var taskDomain = task.domain || domain.create();
                 taskDomain.bind(task.cb)(err, data);
             });
-            });
-            delete self.queues[key];
         }
 
         self.store.get(key, function(err, result) {

lib/multi_caching.js

@@ -78,13 +78,13 @@ var multi_caching = function(caches) {
         self.queues[key] = [{cb: cb, domain: process.domain}];
 
         function fillCallbacks(err, data) {
-            self.queues[key].forEach(function(task) {
+            var waiting = self.queues[key];
-                process.nextTick(function() {
+            delete self.queues[key];
+
+            waiting.forEach(function(task) {
                 var taskDomain = task.domain || domain.create();
                 taskDomain.bind(task.cb)(err, data);
             });
-            });
-            delete self.queues[key];
         }
 
         get_from_highest_priority_cache(key, function(err, result, index) {