Given that you hit a bug it would be cool if you could narrow it down, eg. try the same program on a different architecture or shorten it to a oneliner. Floating point bugs are often architecture specific and so the number of developers to discover them is smaller than for other bugs. Once you get it down to a oneliner it can become part of a test in either the Excel module you're using or perl itself and thus be extinguished. Don't give up on it!