It's an apt description as that code did grow and evolve, constrained by natural selection - only those changes which could be safely made without breaking or e

It's an apt description as that code did grow and evolve, constrained by natural selection - only those changes which could be safely made without breaking or even changing functionality on hundreds of architectures over thousands of platforms ever made it in. Naturally that means it is an ever growing assortment of carefully vetted but otherwise horribly ugly hacks.