We're slowly adding more ES5 features to JavaScriptCore. While Object.freeze is not in yet, we do have Object.defineProperty, which you can use to make individu

We're slowly adding more ES5 features to JavaScriptCore. While Object.freeze is not in yet, we do have Object.defineProperty, which you can use to make individual properties read-only and non-deletable. Once Object.preventExtensions is added, freeze and seal should be trivial.