Interesting peek into how the sausage is actually made.

Also notable: the code is open source, but the test suite is not. I've seen this in other projects, including one I worked on (on the commercial side). It's a little sneaky, particularly in the case that there's a "decoy" test suite open sourced that isn't the real one. Not to say I criticize this: we all need to make a living, but nieve consumers of OSS projects should be aware of this.