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  "environment": {
    "machine": "x86_64",
    "packages": {
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      "numcodecs": "0.16.3",
      "numpy": "2.3.5",
      "pandas": "2.2.3",
      "xarray": "2026.9.0",
      "zarr": "3.1.3"
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    "system": "Linux"
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  "evidence_type": "controlled software observations on synthetic inputs",
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    "Two pinned Xarray releases over the same Zarr-Python backend; not independent Zarr implementations.",
    "The direct backend route is a diagnostic control, not a supported-API migration recommendation.",
    "Local unsharded synthetic int32 arrays only; no incidence, cloud, power-loss or Dask claim.",
    "Repeated deterministic runs are a reproducibility check, not independent statistical samples.",
    "Storage fill is zero; the prior Zarr-only experiment used -999.",
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