throw in a little asynchrony

lib/schedule.js

@@ -68,7 +68,6 @@ var isEmpty = function (map) {
     return true;
 };
 
-// XXX enforce asynchrony everywhere
 module.exports = function () {
     // every scheduler instance has its own queue
     var queue = WriteQueue();
@@ -111,7 +110,7 @@ module.exports = function () {
             if (typeof(local.waiting) !== 'function') {
                 return void collectGarbage();
             }
-            local.waiting();
+            setTimeout(local.waiting);
         });
     };