thoughtbot/dotfiles — pull request #72 by croaky (2012-11-11 21:42:48+00:00)
Title: Add churn alias

After you commit a bug fix to a feature branch, find out if the code
you changed to fix the bug is in files that change often:

churn

If the buggy code changes often, find smells and refactor them. Separate
the parts that change often from the parts that don't.

Conversely, avoid refactoring areas with low churn. Refactoring changes
code, and with each change, you risk introducing new bugs.