According to the spec if fromIndex is NaN or undefined the search will start from 0. Step 5 of Array.prototype.lastIndexOf performs ToInteger(fromIndex). This is in contradiction with String.prototype.lastIndexOf, where even if I pass a NaN or undefined for position value, the search will start again from the end of the string. I am wondering what is the intention of that decision, because it seems like bug in specification. Thank you.
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