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* Add `config/initializers/callback_terminator.rb`
Newly generated Rails apps have a new initializer called
`callback_terminator.rb` which sets the value of the configuration option
`config.active_support.halt_callback_chains_on_return_false` to `false`.
As a result, new Rails apps do not halt callback chains when a callback
returns `false`; only when they are explicitly halted with `throw(:abort)`.
The terminator is *not* added when running `rake rails:update`, so returning
`false` will still work on old apps ported to Rails 5, displaying a
deprecation warning to prompt users to update their code to the new syntax.
*claudiob*
* Add `--skip-action-mailer` option to the app generator.
*claudiob*
* Autoload any second level directories called `app/*/concerns`.
*Alex Robbin*
Please check [4-2-stable](https://github.com/rails/rails/blob/4-2-stable/railties/CHANGELOG.md) for previous changes.
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