opacity I missed
non-zero. Also, rather than skipping pixels off the edge off the edge of the image, the closest edge pixel is used. Previously dividing by the zero sum of coefficients could cause invalid results or runtime exceptions. Thanks to David Cantrell's Alpha-NetBSD CPAN test box for revealing this bug.
wide or high (which isn't too useful anyway) was calculating using NaNs on most platforms, and causing an exception on others. Thanks to David Cantrell for producing a backtrace of the crash on his Alpha-NetBSD CPAN test box which made it possible to track this down.
fuzzer + valgrind)
avoid stupidly long conditionals
META.yml from scratch https://rt.cpan.org/Ticket/Display.html?id=47888
- list Debian and Redhat package names for each library - reformatting - update URLs