I've added a section to the wiki page explaining some of the background information (regarding security) and the motivation for removing the library: https://wiki.php.net/rfc/mcrypt-viking-funeral#background_information_regarding_security
This is not a substantive change to the proposal; it is provided for people reading the RFC that miss parts of the mailing list discussion. Scott Arciszewski Chief Development Officer Paragon Initiative Enterprises <https://paragonie.com>