Array#indexOf and Array#lastIndexOf question

I noticed that most Array methods perform [[HasProperty]] checks on
the index values.
Array#indexOf and Array#lastIndexOf do not. Firefox 3, Safari 4,
Chrome 2 all seem to check [[HasProperty]] for Array#indexOf and
lastIndexOf.

Is this an oversight on the draft or did the browser vendors miss something ?

- John-David Dalton
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