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In algorithm step 2.4 of ยง4.2.20.3, oldLenDesc is undefined. Should this just say "If A represents a read-only or fixed-length array..." as in 3.3.1? In algorithm step 3, attempts to set an element with index >= length are blocked for read-only arrays. But it still allows indexes < length to set new values on read-only arrays.
You're right, thanks. (I also removed the SameValue checks.)