Part of https://discourse.jujucharms.com/t/read-before-contributing/47, an opinionated guide by William Reade
Juju-specific Heuristics
The overarching concept of Juju is that the user describes the model they want, and we wrangle reality to make it so. This overriding force shapes everything we do, and failure to pay attention to it causes serious problems. This section explores the impact of this approach on the code you have to write.