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+* Ensure that mutations of the array returned from `ActiveRecord::Relation#to_a`
+ do not affect the original relation, by returning a duplicate array each time.
+
+ This brings the behavior in line with `CollectionProxy#to_a`, which was
+ already more careful.
+
+ *Matthew Draper*
+
* Fixed `where` for polymorphic associations when passed an array containing different types.
Fixes #17011.