mlx-bun library API
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    interface TrellisSpec {
        axis: 0 | 1;
        code: string;
        L: number;
    }
    Index
    axis: 0 | 1

    1 = coded along the input dim (stored [out, in·k/32]); 0 = along the output dim (stored [in, out·k/32], i.e. Wᵀ coded along its last axis).

    code: string
    L: number