++!

As a side note, I notice that the more complicated my modules are/get, the better my documentation gets, because I have to read the documentation myself to know how to use what I wrote myself. Yes, a system can get complicated or expressive enough for even the author not to use all edge cases.

Especially when you write/wrote a feature to please someone else, and never saw a (good) use-case yourself, a day may come you think "didn't I implement something like this already?" and then you read your own docs. Proceless!