rails--rails/activesupport/CHANGELOG.md

• Change default serialization format of MessageEncryptor from Marshal to JSON for Rails 7.1.

  Existing apps are provided with an upgrade path to migrate to JSON as described in guides/source/upgrading_ruby_on_rails.md

  Zack Deveau and Martin Gingras

• Add ActiveSupport::TestCase#stub_const to stub a constant for the duration of a yield.

  DHH

• Fix ActiveSupport::EncryptedConfiguration to be compatible with Psych 4

  Stephen Sugden

• Improve File.atomic_write error handling

• Fix Class#descendants and DescendantsTracker#descendants compatibility with Ruby 3.1.

  The native Class#descendants was reverted prior to Ruby 3.1 release, but Class#subclasses was kept, breaking the feature detection.

  Jean Boussier

Please check 7-0-stable for previous changes.