mlx-bun library API
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    Wall milliseconds per speculative round phase (see GenerateStats.spec).

    interface SpecPhaseMs {
        commit: number;
        draft: number;
        draftOps?: Record<string, number>;
        layers?: Record<string, number>;
        rounds: number;
        sample: number;
        verify: number;
        verifyOps?: Record<string, number>;
    }
    Index
    commit: number

    Target transaction resolve plus draft commit. Includes retained-state evaluation when the target/drafter supply diagnostic materialize hooks.

    draft: number

    draft(): the drafter's chain including its proposal readback.

    draftOps?: Record<string, number>
    layers?: Record<string, number>

    Target-forward component wall ms (MLX_BUN_SPEC_LAYER_PROFILE=1): per-op evaluation barriers inside the verify forward, so verify grows while set.

    rounds: number
    sample: number

    Window sampling and its readback, plus the host accept walk.

    verify: number

    Target verify forward, forced to completion before sampling.

    verifyOps?: Record<string, number>

    Graph nodes built per op name (MLX_BUN_SPEC_OP_INVENTORY=1), summed over rounds.