... which still wouldn't fix this problem, because the initializer is not a required parameter. It's allowed to be omitted by design, to signify that the first

... which still wouldn't fix this problem, because the initializer is not a required parameter. It's allowed to be omitted by design, to signify that the first element shall be skipped and never passed as the second arg to the callback—or to put it another way, instead of being called once for each element, it's meant to handle the gaps between elements.