The expression return $this->get(serega...URCE_AVAILABLE_LOCALES) also could return the type boolean which is incompatible with the documented return type array.
The expression return $this->get(serega...CE_AVAILABLE_COUNTRIES) also could return the type boolean which is incompatible with the documented return type array.
The expression return $this->get(serega...VAILABLE_ACCOUNT_TYPES) also could return the type boolean which is incompatible with the documented return type array.