Hi, I've added delta support to Module::CoreList, which makes it a bit smaller, I'm not sending it to the list or RT because it's huge (mostly removed lines), it's at: https://github.com/dgl/perl/commit/e08139414a12cd6d613816f6eeee39b95a63538 Yes it uses tie, which I'm not entirely pleased with however see for example: http://grep.cpan.me/?q=%5C%24Module%3A%3ACoreList%3A%3Aversion for the sheer amount of stuff reading from those hashes. (There's also another cleanup patch on top of it to reduce the manual work needed to alias releases: https://github.com/dgl/perl/commit/8d2b6197299cd9c5cf45bbc4016850cab1bd348f) DavidThread Next