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      {
        "stratum": "warm",
        "blockIndex": 36,
        "blockId": "warm-36",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 37,
        "blockId": "warm-37",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 38,
        "blockId": "warm-38",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 39,
        "blockId": "warm-39",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 40,
        "blockId": "warm-40",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 41,
        "blockId": "warm-41",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 42,
        "blockId": "warm-42",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 43,
        "blockId": "warm-43",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 44,
        "blockId": "warm-44",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 45,
        "blockId": "warm-45",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 46,
        "blockId": "warm-46",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 47,
        "blockId": "warm-47",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 48,
        "blockId": "warm-48",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 49,
        "blockId": "warm-49",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 50,
        "blockId": "warm-50",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 51,
        "blockId": "warm-51",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 52,
        "blockId": "warm-52",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 53,
        "blockId": "warm-53",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 54,
        "blockId": "warm-54",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 55,
        "blockId": "warm-55",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 56,
        "blockId": "warm-56",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 57,
        "blockId": "warm-57",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 58,
        "blockId": "warm-58",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 59,
        "blockId": "warm-59",
        "order": [
          "wasm-linear-controlled",
          "js-controlled"
        ]
      },
      {
        "stratum": "warm",
        "blockIndex": 60,
        "blockId": "warm-60",
        "order": [
          "js-controlled",
          "wasm-linear-controlled"
        ]
      }
    ],
    "commitRule": "A block is committed only when both variant records pass correctness/work/hash validation and exact owned-process/profile cleanup passes.",
    "partialPairPolicy": "retain-as-failed-or-blocked-never-summarize",
    "substitutionsAllowed": false,
    "retriesAllowed": false,
    "slowValidSamplePolicy": "retain",
    "strataPoolingAllowed": false
  },
  "statistics": {
    "headlineInput": "committed-pairs-only",
    "withinLaunchVariantStatistic": "median-even-average-v1 of every finite valid scored post-calibration fixed-work sample",
    "pairedEstimator": {
      "transform": "natural-log of (wasm-linear-controlled within-launch median / js-controlled within-launch median)",
      "point": "median-even-average-v1 of finite per-launch paired log ratios",
      "reportedRatio": "exp(point)",
      "absoluteEffect": {
        "perLaunch": "wasm-linear-controlled within-launch median minus js-controlled within-launch median in milliseconds",
        "point": "median-even-average-v1 of finite per-launch absolute differences",
        "interval": "exact-distribution-free-sign-order-statistic-v1 using the same per-look alpha as the log-ratio interval"
      }
    },
    "absoluteDistributions": [
      "count",
      "median-even-average-v1",
      "mean",
      "p5-type7",
      "p25-type7",
      "p75-type7",
      "p95-type7",
      "p99-type7",
      "MAD-median-even-average-v1",
      "IQR-type7",
      "all raw samples"
    ],
    "confidenceInterval": {
      "algorithm": "exact-distribution-free-sign-order-statistic-v1",
      "parameter": "population median of finite committed paired values",
      "twoSidedAlphaPerAttemptLook": 0.01,
      "boundRule": "Sort n finite values ascending. Let k be the largest integer >=0 with 2*P(Binomial(n,0.5)<=k)<=0.01. Return one-based order statistics [X_(k+1), X_(n-k)]. If no such k exists, return [-Infinity,+Infinity]. Ties are retained.",
      "binomialArithmetic": "exact integer binomial coefficients divided by 2^n; no normal approximation",
      "nonfinitePolicy": "reject paired value before commitment; never coerce or remove after commitment",
      "tiePolicy": "retain every tied committed value",
      "medianEvenConvention": "arithmetic mean of the two central sorted finite values",
      "implementationId": "paired-statistics-v1"
    },
    "descriptiveBootstrap": {
      "role": "descriptive-sensitivity-only-never-confidence-or-stopping",
      "algorithm": "paired-percentile-bootstrap-type7-v1",
      "resamples": 10000,
      "prng": "xorshift32-v1",
      "baseSeed": "0x7a31c9e5",
      "zeroStateReplacement": "0x6d2b79f5",
      "stateTransition": "uint32 x ^= x << 13; x ^= x >>> 17; x ^= x << 5; output uint32 x",
      "wordToIndex": "multiply-high: floor(uint32_word * sample_count / 2^32)",
      "streamDerivation": "FNV-1a-32 UTF-8 of 0x + eight-lowercase-hex-baseSeed + colon + stratum + colon + attempted-checkpoint + colon + paired-log-ratio-v1, xor baseSeed uint32; replace zero state before first draw",
      "resampleUnit": "one derived per-launch paired log ratio; absolute differences and target medians are not bootstrap inputs",
      "pointPerResample": "median-even-average-v1 of the resampled per-launch paired log ratios",
      "percentiles": [
        0.005,
        0.5,
        0.995
      ],
      "percentileInterpolation": "type-7 linear interpolation: h=(N-1)*p, interpolate sorted[floor(h)] to sorted[ceil(h)]",
      "strataSeparate": true,
      "estimand": "median-even-average-v1 of per-launch natural-log(wasm-linear-controlled within-launch median / js-controlled within-launch median)",
      "inputContract": "Two equal-length arrays of finite positive committed within-launch medians, JavaScript first and Wasm second; derive exactly one natural-log ratio per paired launch internally."
    },
    "sequentialProtection": {
      "familyWiseAlpha": 0.05,
      "attemptLooksPerStratum": 5,
      "method": "Bonferroni over frozen attempted-launch checkpoints",
      "twoSidedAlphaPerAttemptLook": 0.01,
      "twoSidedConfidenceLevelPerAttemptLook": 0.99,
      "attemptCheckpoints": [
        20,
        30,
        40,
        50,
        60
      ],
      "analysisAtCheckpoint": "Use every committed pair available after that many attempted launches only when at least 20 committed pairs exist."
    },
    "precision": {
      "metric": "multiplicative exact-CI half-width",
      "formula": "exp((upperLogCi-lowerLogCi)/2)-1",
      "targetMaximum": 0.03,
      "finiteBoundsRequired": true
    },
    "stopRules": [
      "Never inspect precision except after attempted-launch checkpoints 20, 30, 40, 50, and 60 in a stratum.",
      "At a checkpoint with at least 20 committed pairs, stop that stratum only when the exact 99% paired-log order-statistic interval has finite bounds and multiplicative half-width at most 3%.",
      "After 60 attempted launches, stop the stratum. Label precision-met if the criterion is met; otherwise label cap-inconclusive, including when fewer than 20 pairs committed.",
      "The experiment completes only after both strata terminate; strata are never pooled; failed or blocked planned launches are not retried or substituted."
    ],
    "sensitivity": [
      "descriptive paired bootstrap never used for confidence or stopping",
      "all committed pairs",
      "order-separated effects",
      "failed and blocked denominator accounting",
      "absolute distributions without outlier removal"
    ]
  },
  "accounting": {
    "statuses": [
      "planned",
      "attempted",
      "committed",
      "failed-correctness",
      "failed-measurement",
      "blocked-containment",
      "blocked-cache",
      "blocked-provenance",
      "unstarted"
    ],
    "attemptedDefinition": "owned Chrome launch began after permit consumption",
    "attemptCheckpoints": [
      20,
      30,
      40,
      50,
      60
    ],
    "fixedCapAttemptedPerStratum": 60,
    "terminalLabels": [
      "precision-met",
      "cap-inconclusive"
    ],
    "checkpointAccounting": "At every attempted checkpoint reconcile attempted = committed + failed-correctness + failed-measurement + blocked-containment + blocked-cache + blocked-provenance; unstarted = 60 - attempted.",
    "committedDenominatorOnly": true,
    "noRetryOrSubstitution": true,
    "everyPlannedBlockReconciled": true,
    "unavailableMetricPolicy": "typed-unavailable-with-reason-never-zero"
  },
  "instrumentation": {
    "headline": {
      "profilerEnabled": false,
      "tracingEnabled": false,
      "heapSnapshotEnabled": false,
      "forcedGc": false,
      "memoryPolling": false,
      "claimScope": "uninstrumented-headline"
    },
    "diagnostics": {
      "separateLaunchesAndPermitRequired": true,
      "neverEnterHeadlineCells": true,
      "allowed": [
        "CDP Performance metrics",
        "Runtime heap usage",
        "DOM counters",
        "owned-process RSS/PSS",
        "v8.wasm trace",
        "heap/allocation profile"
      ],
      "unavailableMetricPolicy": "typed-unavailable-with-source-scope-timestamp-never-zero"
    }
  },
  "permitEnvelope": {
    "state": "template-only-not-consumed",
    "singleUse": true,
    "experimentId": "m1-chrome-sum-u32-v1",
    "exactOrigin": "http://127.0.0.1:8787",
    "exactBrowserVersion": "150.0.7871.24",
    "exactBinarySha256": "dea3ab8fba923b718920ef9d62570824f2dc0ab0c72d66d53f91b41de6570355",
    "maximumOwnedBrowserLaunches": 120,
    "maximumPerStratum": 60,
    "deadlineRequired": true,
    "maximumValidityHours": 24,
    "allowedOperation": "collect-uninstrumented-headline-paired-corpus",
    "retryAfterFailureRequiresNewPermit": true,
    "authorizationStatement": "This preregistration is a frozen, unconsumed permit template only. It does not authorize, instantiate, consume, retry, or claim any browser launch."
  },
  "publication": {
    "publishAllDenominatorRows": true,
    "publishRawSamples": true,
    "privateOnly": [
      "profile paths",
      "DevTools endpoints",
      "raw headers and bodies",
      "local filesystem paths",
      "process command lines containing private paths"
    ],
    "missingEvidenceNeverPasses": true
  }
}