The package name (nodejs-git 20110613-1) confused me. I assumed it was a snapshot from 2011-06-13, but after looking at the PKGBUILD file I see that it is cloning the github repo. My mistake.
(example: x264-git, pretty much requires that you also install libav-git/mplayer-git, and then of course blender doesn't work, and so on. It can become quite messy at times.)