Memoize will now play nicely with Nodejs domains.

lib/async.js

@@ -181,6 +181,12 @@
             return iterator(value, callback);
         };
     }
+
+    // binds a callback to a domain, necessary in Node if a callback may be resolved in a different context, such as with memoize()
+    function bindToCurrentDomain(callback) {
+        if (typeof process !== "object" || process.domain == null || callback == null) return callback;
+        return process.domain.bind(callback);
+    }
 
     //// exported async module functions ////
 
@@ -1095,7 +1101,7 @@
                 });
             }
             else if (key in queues) {
-                queues[key].push(callback);
+                queues[key].push(bindToCurrentDomain(callback));
             }
             else {
                 queues[key] = [callback];