Given that 15.4.5.2 makes arrays' length properties non-configurable, it seems to me that all the care taken in step three of the custom [[DefineOwnProperty]] method in 15.4.5.1 is to no avail, as the default [[DefineOwnProperty]] will refuse to make any changes anyway.

I've filed a Trac ticket for this:
http://bugs.ecmascript.org/ticket/473

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