mlx-bun library API
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    One contiguous range of positions in a single sequence's prompt piece. The scheduler selects the operation; the graph never inspects its shape.

    interface MlxPromptRange {
        from: number;
        operation: MlxCapturingForward;
        to: number;
        unit?: "gpu" | "ane";
    }
    Index
    from: number
    to: number
    unit?: "gpu" | "ane"