rails--rails/activesupport/CHANGELOG.md

• Add action_controller_api and action_controller_base load hooks to be called in ActiveSupport.on_load

  ActionController::Base and ActionController::API have differing implementations. This means that the one umbrella hook action_controller is not able to address certain situations where a method may not exist in a certain implementation.

  This is fixed by adding two new hooks so you can target ActionController::Base vs ActionController::API

  Fixes #27013.

  Julian Nadeau

• Add fetch_values for HashWithIndifferentAccess

  The method was originally added to Hash in Ruby 2.3.0.

  Josh Pencheon

Please check 5-1-stable for previous changes.