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Returning a non-`null` value on this fillter will cause `wp_unique_post_slug()` to return early with that value, skipping potentially expensive database queries on some sites. Props coffee2code, javorszky, iCaleb. Fixes #21112. git-svn-id: https://develop.svn.wordpress.org/trunk@44454 602fd350-edb4-49c9-b593-d223f7449a82