Hi, In getOwnPropertyDescriptor and getPropertyDescriptor traps of the no-op forwarding proxy example, the "desc.configurable = true" instruction fails if desc is undefined (which happens when the property is undefined). A "if(typeof(desc) === 'object')" beforehand saves the situation.
Just for the record, on the only implementation I know (FF4b10), there is a bug if either of these method returns undefined : https://bugzilla.mozilla.org/show_bug.cgi?id=582967 David
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