Revision: 4287
Author: [email protected]
Date: Sun Sep 26 14:53:04 2010
Log: Edited wiki page DifferencesBetweenES5Over3AndES5 through web user
interface.
http://code.google.com/p/google-caja/source/detail?r=4287
Modified:
/wiki/DifferencesBetweenES5Over3AndES5.wiki
=======================================
--- /wiki/DifferencesBetweenES5Over3AndES5.wiki Fri Sep 24 20:03:40 2010
+++ /wiki/DifferencesBetweenES5Over3AndES5.wiki Sun Sep 26 14:53:04 2010
@@ -17,10 +17,11 @@
* No `Function` constructor
* `Object.prototype` is frozen
* The true global object is inaccessible
- * Property names may not end in two underscores
+ * Property names must not end in two underscores
* Does not support creating objects with null prototype
* In a method call, the getter is called after arguments are evaluated
([http://code.google.com/p/v8/issues/detail?id=691 V8 has the same issue])
* Whereas ES5/strict specifies no `this` coercion, ES5/3 will coerce
primitive values to wrappers (as ES3 and ES5/non-strict do), and will
coerce `null` and the global object to `undefined`.
+ * Many coercions to string that should be implemented by `String(obj)`
are instead implemented by `('' + obj)` since the latter is noticeably
faster. The difference is that `valueOf` gets called first in circumstances
where `toString` should have been called first.
* Numerically named properties and `'length'`
* Does not support FF2
* All numeric own properties of the same object share one property
descriptor
@@ -36,9 +37,12 @@
= Differences between ES5/3 and selected ES-Harmony features =
* Proxies
- * Proxies can't trap numeric properties or 'length'
+ * Proxies cannot trap numeric properties or 'length'.
+ * Might not be fixed: Proxies cannot (yet?) inherit from extensible
objects.
+ * To be fixed: Proxies cannot yet inherit from other proxies.
+ * To be fixed: Non-proxies inheriting from proxies is currently broken.
* "Leaky" ephemeron tables
- * Membranes hold onto all references that they wrap until the membrane
is revoked
+ * Membranes hold onto all references that they wrap until the membrane
is revoked.
= Sources for the ES5/3 additions to Caja =
