fix for caolan#1358

Author: aearly

lib/auto.js

@@ -108,7 +108,7 @@ export default function (tasks, concurrency, callback) {
     var runningTasks = 0;
     var hasError = false;
 
-    var listeners = {};
+    var listeners = Object.create(null);
 
     var readyTasks = [];
 
@@ -203,7 +203,7 @@ export default function (tasks, concurrency, callback) {
                 });
                 safeResults[key] = args;
                 hasError = true;
-                listeners = [];
+                listeners = Object.create(null);
 
                 callback(err, safeResults);
             } else {

mocha_test/auto.js

@@ -394,4 +394,43 @@ describe('auto', function () {
         isSync = false;
     });
 
+    // Issue 1358 on github: https://github.com/caolan/async/issues/1358
+    it('should report errors when a task name is an array method', function (done) {
+        async.auto({
+            'one': function (next) {
+                next('Something bad happened here');
+            },
+            'filter': function (next) {
+                _.delay(function () {
+                    next(null, 'All fine here though');
+                }, 25);
+            },
+            'finally': ['one', 'filter', function (a, next) {
+                _.defer(next);
+            }]
+        }, function (err) {
+            expect(err).to.equal('Something bad happened here');
+            _.delay(done, 30);
+        });
+    });
+
+    it('should report errors when a task name is an obj prototype method', function (done) {
+        async.auto({
+            'one': function (next) {
+                next('Something bad happened here');
+            },
+            'hasOwnProperty': function (next) {
+                _.delay(function () {
+                    next(null, 'All fine here though');
+                }, 25);
+            },
+            'finally': ['one', 'hasOwnProperty', function (a, next) {
+                _.defer(next);
+            }]
+        }, function (err) {
+            expect(err).to.equal('Something bad happened here');
+            _.delay(done, 30);
+        });
+    });
+
 });