mlx-bun library API
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    DrafterTrainProgress:
        | {
            config: DflashConfig;
            parameters: number;
            resumed: boolean;
            shards: number;
            train: number;
            type: "start";
            validation: number;
        }
        | { iters: number; loss: number; lr: number; step: number; type: "step" }
        | {
            perPosition: number[];
            saved: boolean;
            step: number;
            tau: number;
            type: "eval";
        }