mlx-bun library API
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    A whole accepted span uses one declared operation; callers must not split it to fit a verification table because that can change attention arithmetic.

    interface MlxKnownRange {
        from: number;
        operation: MlxPhaseForward;
        to: number;
    }
    Index
    from: number
    operation: MlxPhaseForward
    to: number