mlx-bun library API
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    What acquiring a model would do, for previews.

    interface ResidencyPlan {
        evict: readonly string[];
        fits: boolean;
        freeBytes: number;
        requiredBytes: number;
    }
    Index
    evict: readonly string[]

    Least recently used first; empty when it fits without evicting.

    fits: boolean
    freeBytes: number
    requiredBytes: number