API 限流 Bug 定位
让模型分析伪代码中的限流边界问题并提出测试。
Prompt Content
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下面的伪代码用于限制每个用户每分钟最多 100 次请求：count = redis.incr(key); if count == 1 then expire(key, 60); if count > 100 reject else allow。请指出至少两个潜在问题，并给出对应测试用例。
Use Cases
Reference Output
问题包括固定窗口突刺、expire 失败导致 key 永久存在、并发边界、时钟窗口不平滑等。
Scoring Rubric
5分：指出问题并配测试；3分：只指出问题；1分：只建议换算法但无诊断。
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