Merge pull request #94 from juandopazo/odp-fix

Improve Object.defineProperty feature detection

Author: andyearnshaw

src/core.js

@@ -20,8 +20,13 @@ import {
 var Intl = {},
 
     realDefineProp = (function () {
-        try { return !!Object.defineProperty({}, 'a', {}); }
-        catch (e) { return false; }
+        var sentinel = {};
+        try {
+            Object.defineProperty(sentinel, 'a', {});
+            return 'a' in sentinel;
+        } catch (e) {
+            return false;
+        }
     })(),
 
     // Need a workaround for getters in ES3