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* Fix logging edge case where if an attribute was of the binary type and was provided as a Hash.
*Jon Moss*
* Handle JSON deserialization correctly if the column default from database adapter returns `''` instead of `nil`. *Johannes Opper*
* Introduce ActiveRecord::TransactionSerializationError for catching transaction serialization failures or deadlocks. *Erol Fornoles*
Please check [5-0-stable](https://github.com/rails/rails/blob/5-0-stable/activerecord/CHANGELOG.md) for previous changes.