Luxar Viewer API Documentation - v2026.9.22
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    Variable COMPOSABLE_ATTRS_ARE_RENDER_ATTRSConst

    COMPOSABLE_ATTRS_ARE_RENDER_ATTRS: Exclude<
        keyof ComposableAttrs,
        "customLutBytes",
    > extends RenderAttrKey
        ? true
        : false = true

    Lock (B10): every on-disk key ComposableAttrs reads is one of the contract's render_attr_keys — the Python writer's typo allowlist — so the composer can never read a key the writer would refuse. customLutBytes is loader-side state, not an attr, and is excluded.