```json
{
  "criteria": {
    "c1": "met",
    "c2": "met",
    "c3": "not_met",
    "c4": "not_met",
    "c5": "not_met"
  },
  "note": "c3 is not met because `cond.wait()` releases the lock while waiting, allowing newer callers to enter and consume refilled tokens ahead of earlier waiting coroutines. c4 is not met because the bucket initializes full with 5 tokens, meaning 10 tokens require only 1 second of refill time instead of 2 seconds, failing the assertion."
}
```