4 - update the bundled (and still modified) Devel::CheckLib
5 https://rt.cpan.org/Ticket/Display.html?id=69170
7 - use snprintf() when imconfig.h indicates it's available
8 https://rt.cpan.org/Ticket/Display.html?id=69147
13 - the big types cleanup
18 Split off from Imager.