mlx-bun library API
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    Optional arrays captured from the same post-processor logprobs used to sample a token. The caller controls readback timing and owns disposal.

    interface StepExtras {
        sel: MlxArray | null;
        topIdx: MlxArray | null;
        topVals: MlxArray | null;
    }
    Index
    sel: MlxArray | null
    topIdx: MlxArray | null
    topVals: MlxArray | null