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## Rails 4.0.0 (unreleased) ##
+* Fix dirty attribute checks for TimeZoneConversion with nil and blank
+ datetime attributes. Setting a nil datetime to a blank string should not
+ result in a change being flagged. Fix #8310
+
+ *Alisdair McDiarmid*
+
* Prevent mass assignment to the type column of polymorphic associations when using `build`
Fix #8265