Yes, arguably that step isn't needed at all because step 20.b implicitly sets the length
>-----Original Message-----
>From:
es-discuss-bounces@... [mailto:es-discuss-
>
bounces@...] On Behalf Of Jeff Walden
>Sent: Monday, September 21, 2009 2:32 PM
>To:
es-discuss@...
>Subject: Clear bug in 15.10.6.2 step 17
>
>17. Call the [[DefineOwnProperty]] internal method of A with arguments
>"length", Property Descriptor
>{[[Value]]: n + 1, [[Writable]: true, [[Enumerable]]: true,
>[[Configurable]]: true}, and true.
>
>This is attempting to define an enumerable, configurable length property
>on an array, which will throw an exception trying to change the
>configurability of a non-configurable property.
>
>Jeff
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