mlx-bun library API
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    Padding is interpreted by cache geometry, independently of scheduling. Left padding initializes an empty group; lengths count input columns before trailing padding. Finalize before ordinary decode or publishing checkpoints.

    interface PrefillPadding {
        leftPadding?: readonly number[];
        lengths: readonly number[];
        rightPadding?: readonly number[];
    }
    Index
    leftPadding?: readonly number[]
    lengths: readonly number[]
    rightPadding?: readonly number[]