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* Change the way in which callback chains can be halted.
The preferred method to halt a callback chain from now on is to explicitly
`throw(:abort)`.
In the past, returning `false` in an ActiveModel or ActiveModel::Validations
`before_` callback had the side effect of halting the callback chain.
This is not recommended anymore and, depending on the value of the
`config.active_support.halt_callback_chains_on_return_false` option, will
either not work at all or display a deprecation warning.
Please check [4-2-stable](https://github.com/rails/rails/blob/4-2-stable/activemodel/CHANGELOG.md) for previous changes.
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