wp-admin/includes/class-wp-importer.php:204Sorts by strlen, longest string first.
$astring$bstringint public function cmpr_strlen( $a, $b ) { return strlen( $b ) - strlen( $a ); }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-importer.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.