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More commenting of zslUpdateScore().
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@ -259,6 +259,8 @@ zskiplistNode *zslUpdateScore(zskiplist *zsl, double curscore, sds ele, double n
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zskiplistNode *update[ZSKIPLIST_MAXLEVEL], *x;
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int i;
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/* We need to seek to element to update to start: this is useful anyway,
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* we'll have to update or remove it. */
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x = zsl->header;
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for (i = zsl->level-1; i >= 0; i--) {
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while (x->level[i].forward &&
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