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The duplicate-label-set rejection must not fire when a label rewrite keeps every series distinct through another label. Normalizing mixed histogram boundary representations (`10.0` -> `10`) while `instance` still differs is the false positive reported in #9444. The check already accounts for it since it became a per-timestamp row count instead of a planning-time rejection, but no fixture covered the positive case. Add one, together with the aggregation variant that produces a genuine duplicate and must still fail. Signed-off-by: fengyue-xve <1759519137@qq.com>