mlx-bun library API
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    interface QuantSpec {
        bits: number;
        groupSize: number;
        mode: string;
        trellis?: TrellisSpec;
    }
    Index
    bits: number
    groupSize: number
    mode: string
    trellis?: TrellisSpec

    mode: "trellis" (packed trellis-coded weights, packages/inference/src/layers/trellis-linear.ts): bits = k per weight, groupSize = block T, plus the codec geometry.