cotap/stacker — pull request #14 by kainosnoema (2014-11-22 01:04:53+00:00)
Title: Enforce non-destructive update policy by default, requiring override

It's a little too easy to accidentally replace or destroy a resource unintentionally, simply by changing a parameter of an existing stack. This change ensures that you're at least aware of the risks before moving forward with a potentially risky update.