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          4.0,
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          16.0,
          20.0,
          24.0,
          28.0,
          32.0,
          36.0,
          40.0
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        "iterations": [
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  "environment": {
    "native_build": "release",
    "allocator": "default Rust system allocator",
    "host_state": "quiet; no competing build or benchmark observed during final runs"
  },
  "methodology": {
    "samples_per_case": 10,
    "warmup_seconds": 0.3,
    "measurement_seconds": 0.5,
    "fixture_setup": "Outside timing; production push on preloaded state; independent final-output validation outside timing",
    "memory_budget": "Unaccounted default operator constructors; budget-accounting/pressure-compaction costs excluded",
    "confidence_intervals": "Criterion bootstrap 95% intervals retained for means and medians; ratios are descriptive means, not ratio confidence intervals",
    "limitations": [
      "No JNI, row/Arrow transposes, Flink scheduling, checkpoints or sinks in the timed kernel",
      "No budget-pressure or deleting-cleanup performance inference",
      "Source suffix widths8/264; generated prefix and row number add bytes; payload null every seventh row",
      "Large cases retain16384 keys; original small-state full-batch path retains1024 keys"
    ],
    "boundary": "Production INNER interval right-side push matching 16 or256 keys against retained unique left-side keys; timestamps1000, bounds[-100,+100]; eager expiration not triggered"
  }
}