@n1xnx @nyrath @n1vux @ianturton @TerryHancock When I was at atomic energy of Canada in 2005 as a high school student with the Deep River Science Academy some of our calculations called a FORTRAN77 fluid simulation library that opened with several pages of comments about its certifications and testing.

I imagine once you've spent the money to certify such things, you really don't want to spend it again if the old code still works.