Definitely. A huge chunk of Python and Ruby packages are written as "C extensions", and if those C extensions are going to get compiled on some platform the dev

Definitely. A huge chunk of Python and Ruby packages are written as "C extensions", and if those C extensions are going to get compiled on some platform the developers haven't tested them on, it will make for fun surprise bugs. I know Java has C extensions for some things too. I'm curious how much code is actually "pure Java", but I've actually rarely seen Java used at any of the places I worked at.