Kong rate-limiting accuracy

Hi,
how accurate is rate-limiting plugin? I set 50reqs/s and 500 reqs/min limits with redis policy and performed some stress tests.
The results:
100 responses with 200 http code (and 200 responses with 429 http code) within 1sec (100% above the limit!)
5848 responses with 200 http code within 10 minutes (16% above the limit!)

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