mlx-bun library API
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    interface AcquireOptions {
        keepAliveSec?: number;
        need?: readonly ModelOperation[];
        role?: ModelRole;
        signal?: AbortSignal;
    }
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    keepAliveSec?: number

    Seconds the model stays loaded after this lease is released, overriding the policy's idleUnloadSec; 0 releases it at once.

    need?: readonly ModelOperation[]

    Rejected with does-not-fit unless the model declares all of these.

    role?: ModelRole
    signal?: AbortSignal