Offtopic, but I've always been a bit confused by the notion of "officially sanctioned" at Google... famously it's "Java, C++, Python, Go", but I've never heard anyone mention Javascript, which they obviously must use... or TypeScript (via Angular), or Dart (AdWords and Fuchsia), or C (Google does tons of Linux work), or ObjC/Swift (all their iOS apps). And these are only for projects we know about (if there's no Perl code running somewhere at Google, I'll eat my hat). So what does the officially-sanctioned language list determine?