Thanks for the kind words. For context, I'm an HHVM alum who has been at Facebook for almost six years now (wow time flies). From my point of view, most of wha

Thanks for the kind words. For context, I'm an HHVM alum who has been at Facebook for almost six years now (wow time flies). From my point of view, most of what has changed is resources and the immediacy of our survival-level concerns. Four years ago Google had declared nuclear war on us, we had far fewer users, we were not profitable, there were constant fires to put out with basic production operations stuff we've gotten better at, and we were enormously more under-staffed. I was working on HHVM already, but it was in a million little pieces spread across Drew's, Jason's, and my desks. The tools we're open sourcing over the last two years mostly did not yet exist, and if they existed, it was in some primordial form. We also have gotten much, much better imho at being good stewards of our open source projects; HHVM's predecessor system, the HipHop compiler, was also open source, but we people were spread way too thin to be able to respond to bug reports, pull requests, get FB's latest code into public hands, build binary packages for popular distros, etc. on a timely basis. Huge props are due to all of the technical people on our open source teams.