wp-includes/class-wp-admin-bar.php:186$argsarray final protected function _set_node( $args ) { $this->nodes[ $args['id'] ] = (object) $args; }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-includes/class-wp-admin-bar.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.