[wp-hackers] Unique permalinks vs. unique post slugs

[scribu]

>
> That check would be quite expensive, actually, as it would require
> that you verify every "part" of the permalink in a page request. As it
> stands now, it merely figures out the most specific part (easy to do)
> and looks for a matching result. One database hit instead of several.
> No result = 404. No verification of anything needed.
>

What about nested pages? You can have pages with different parents and the
same slug. Why isn't that expensive?

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