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  "boundaries": [
    "One synthetic 8-bit RGB still image; not representative compression benchmarking.",
    "Pixel equality checked with sharp decoded raw RGB in this environment. This is not a cross-decoder conformance test.",
    "No HDR, animation, 16-bit or imported EXIF sample was tested.",
    "Croppings are PNG decodes enlarged 3× with nearest-neighbour; not browser-native JXL decoding.",
    "Cover WebP is an illustration only; inspect the PNG samples to assess differences."
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}