wp-includes/class-wp-customize-manager.php:4052Registers a customize section type.
$sectionstring public function register_section_type( $section ) { $this->registered_section_types[] = $section; }Introduced in 4.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-customize-manager.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.