I&#x27;m not convinced Von Neumann debiasing is vulnerable like you think.  You&#x27;re dropping runs (00&#x27;s and 11&#x27;s) so you don&#x27;t care if it&#x27;s 90% 0 or 90% 1, you care if there&#x27;s an even number of a run or an odd number of a run.<p>In other words:<p>0000000000000001
000000001
001<p>...are all interchangeable.  So biases can change all day.<p>There are _other_ issues I&#x27;ve seen in real world data, but not this one.