wp-includes/class-wp-customize-manager.php:826Gets the changeset UUID.
string public function changeset_uuid() { if ( empty( $this->_changeset_uuid ) ) { $this->establish_loaded_changeset(); } return $this->_changeset_uuid; }Introduced in 4.7.0. 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.