thoughtbot/guides — pull request #154 by jferris (2014-03-18 15:41:25+00:00)
Title: Use `or` for Ruby alternatives to `nil`

* Clarify boolean expression rule for `&&`, `||`
* Suggest `or` for expressions not involving `true` or `false`

https://github.com/thoughtbot/whetstone/pull/30/files#r10706657