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