Luxar Viewer API Documentation - v2026.9.22
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    Type Alias RootAttrKey

    RootAttrKey: Extract<
        AttrKey,
        | "format_version"
        | "format_type"
        | "luxar_software_version"
        | "type"
        | "content_hash"
        | "scene_dimensions"
        | "position_bounds",
    >

    The contract's structural attr_keys a scene ROOT carries. Lock (B10): each must be a declared key of ZarrSceneAttrs, so a header key added to the contract cannot be silently untyped on the viewer side.