don't use a Vow object, just use Object.create()

lib/vows.js

@@ -80,7 +80,7 @@ function addVow(/* description & callback */) {
         } else {
             vow.callback = args[1], vow.description = args[0];
         }
-    } else if (args[0].constructor.name === 'Vow') {
+    } else if (args[0].callback && args[0].context) {
         vow = args[0];
     } else {
         throw new(Error)("wrong argument type for addVow()");
@@ -281,7 +281,7 @@ vows.tell = function (topic, tests) {
                     return ctx.tests[k] && k !== 'setup';
                 }).forEach(function (item) {
                     // Holds the current test or context
-                    vow = new(Vow)(ctx.tests[item], ctx.name, item);
+                    vow = Object.create({callback:ctx.tests[item], context:ctx.name, description:item});
 
                     // If we encounter a function, add it to the callbacks
                     // of the `setup` function, so it'll get called once the
@@ -308,7 +308,7 @@ vows.tell = function (topic, tests) {
                 // Check if we're done running the tests
                 tryFinish(--vows.remaining);
             // This is our initial, empty context
-            })(new(Context)(new(Vow)(vows.tests, null, null), {}));
+            })(new(Context)({callback:vows.tests, context:null, description:null}, {}));
         }
     });
     return this.promise;