wp-includes/class-wp-customize-setting.php:633Get the root value for a setting, especially for multidimensional ones.
$default_valuemixedoptionalnullmixed protected function get_root_value( $default_value = null ) { $id_base = $this->id_data['base']; if ( 'option' === $this->type ) { return get_option( $id_base, $default_value ); } elseif ( 'theme_mod' === $this->type ) { return get_theme_mod( $id_base, $default_value ); } else { /* * Any WP_Customize_Setting subclass implementing aggregate multidimensional * will need to override this method to obtain the data from the appropriate * location. */ return $default_value; } }Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-customize-setting.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.