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Fix comments for correctness in zunionInterGenericCommand().
Related to issue #1240.
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@ -1640,7 +1640,7 @@ void zunionInterGenericCommand(redisClient *c, robj *dstkey, int op) {
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while (zuiNext(&src[i],&zval)) {
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double score, value;
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/* Skip key when already processed */
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/* Skip an element that when already processed */
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if (dictFind(dstzset->dict,zuiObjectFromValue(&zval)) != NULL)
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continue;
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@ -1648,8 +1648,10 @@ void zunionInterGenericCommand(redisClient *c, robj *dstkey, int op) {
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score = src[i].weight * zval.score;
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if (isnan(score)) score = 0;
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/* Because the inputs are sorted by size, it's only possible
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* for sets at larger indices to hold this element. */
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/* We need to check only next sets to see if this element
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* exists, since we process every element just one time so
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* it can't exist in a previous set (otherwise it would be
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* already processed). */
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for (j = (i+1); j < setnum; j++) {
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/* It is not safe to access the zset we are
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* iterating, so explicitly check for equal object. */
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