Why do some passports change numbers when renewed?
This question is about why the passport number changes? while the proposed duplicate asks if the passport number changes?.
Looking at answers to this question, it seems that most passport numbers change upon renewal. Not all do though, as I have recently discovered. Apparently, Australian ones do change in some cases.
Why does the passport number change? Is there a rationale for this?
It seems that some organization created rules for passports to change when reissued, but again what are the advantages of this, compared to its disadvantages?
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