wp-includes/class-wp-locale.php:434Retrieves the localized list item separator.
string public function get_list_item_separator() { return $this->list_item_separator; }Introduced in 6.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-locale.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.