On Mon, Jun 30, 2014 at 10:18 AM, raul mihaila <[email protected]> wrote:
> While reading the SetPrototypeOf algorithm I noticed that some steps are > repeated. At step 5, if O.[[Extensible]] is false, the method returns > false. But at step 8, the same condition is checked again. It seems to me > that between these steps neither the value of O, nor the value of > O.[[Extensible]] changes. Aren't steps 7 and 8 redundant? > The second set of checks is needed because step 6 might change the results: if one of the objects iterated over in step 6 is a proxy, then arbitrary code can be executed through an invocation of its `getPrototypeOf` handler. This code might make O inextensible or change its __proto__ to be the same value as V.
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