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This question peaks my interest as a programmer. I'll have to say that zero != null. If you haven't been indexed yet, you could actually not have an assigned pagerank, but if you have, and it's zero, that's different from one not having been assigned. That's a distinction intimately familiar to any programmer, but more difficult to explain to anyone else, so I wanted to jump in here.
That said, PR is among the most useless numbers around. Like Adam continues to put it, in a very clear way, PR is only used as a tie-breaker when all other metrics put two results in exactly the same place.
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