Sean and Derek discuss thoughtful deprecations, backwards compatibility, and other joys of library maintenance.

• Trailblazer
• Clearance
• Ember 2.0 - Stability without Stagnation
• Ruby 2.2 on Rails 3.2. Now merged, but unreleased.
• The original removal of ARel type casting
• Narrowing the scope - a less impactful ARel deprecation
• Rails changes to accompany the ARel API changes.
• An example of an issue these refactorings solve.