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module.exports = function* ranked(diter, equ = (a, b) => a == b) {
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let last_doc = null;
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let r = 0, count = 0;
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for (let doc of diter) {
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count++;
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if (count == 1 || !equ(last_doc, doc))
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r = count;
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last_doc = doc;
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yield [r, doc];
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}
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};
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