wp-admin/includes/export.php:492Determines whether to selectively skip post meta used for WXR exports.
$return_mebool$meta_keystringbool function wxr_filter_postmeta( $return_me, $meta_key ) { if ( '_edit_lock' === $meta_key ) { $return_me = true; } return $return_me; }Introduced in 3.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/export.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.