mlx-bun library API
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    interface FillTraceRecord {
        accepted: number;
        actual: number[];
        actualText?: string;
        firstMismatch: number;
        generated: number;
        origin: string;
        policy: string;
        proposed: number[];
        proposedLen: number;
        proposedText?: string;
        ts: string;
    }
    Index
    accepted: number
    actual: number[]
    actualText?: string
    firstMismatch: number

    Index of the first position where the model disagreed, or -1.

    generated: number
    origin: string
    policy: string
    proposed: number[]
    proposedLen: number
    proposedText?: string
    ts: string