wp-includes/pomo/po.php:106Text to include as a comment before the start of the PO contents
$textstring public function set_comment_before_headers( $text ) { $this->comments_before_headers = $text; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/pomo/po.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.