1. 2018-12-12 [PHP-DEV] Re: [RFC][Discuss] Covariant return- and co php-inter Christoph M. Becke 2. 2018-12-12 [PHP-DEV] Re: [RFC][Discuss] Covariant return- and co php-inter Levi Morrison 3. 2018-12-12 [PHP-DEV] Re: [RFC][Discuss] Covariant return- and co php-inter Christoph M. Becke 4. 2018-12-11 [PHP-DEV] Re: [RFC][Discuss] Covariant return- and co php-inter Levi Morrison 5. 2018-12-03 [PHP-DEV] Re: [RFC][Discuss] Covariant return- and co php-inter Levi Morrison