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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