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+* `Hash#deep_transform_keys` and `Hash#deep_transform_keys!` now transform hashes
+ in nested arrays. This change also applies to `Hash#deep_stringify_keys`,
+ `Hash#deep_stringify_keys!`, `Hash#deep_symbolize_keys` and
+ `Hash#deep_symbolize_keys!`.
+
+ *OZAWA Sakuro*
+
+* Fixed confusing `DelegationError` in `Module#delegate`.
+
+ See #15186.
+
+ *Vladimir Yarotsky*
+
* Fixed `ActiveSupport::Subscriber` so that no duplicate subscriber is created
when a subscriber method is redefined.