>>You do realize that the age of the universe is only on the order of
>>around 10^18 seconds, do you? Even if you had a trillion CPUs each
>>chugging along at 3.0 GHz for all this time, the number of processor
>>cycles you will have executed cumulatively is only on the order 10^40,
>>still 37 orders of magnitude lower than the chance for a random hash

Here we go, boiling the oceans again :)

>Suppose you find a weakness in a specific hash algorithm; you use this
>to create hash collisions and now imagined you store the hash collisions 
>in a zfs dataset with dedup enabled using the same hash algorithm.....

Sorry, but isn't this what dedup=verify solves? I don't see the problem here. 
Maybe all that's needed is a comment in the manpage saying hash algorithms 
aren't perfect.
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