wp-includes/pomo/po.php:507$sstringstring public static function trim_quotes( $s ) { if ( str_starts_with( $s, '"' ) ) { $s = substr( $s, 1 ); } if ( str_ends_with( $s, '"' ) ) { $s = substr( $s, 0, -1 ); } return $s; }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.