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-rw-r--r--actionpack/CHANGELOG.md8
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index a47ddb1f21..f5527450c7 100644
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+* Don't let strong parameters mutate the given hash via `fetch`
+
+ Create a new instance if the given parameter is a `Hash` instead of
+ passing it to the `convert_hashes_to_parameters` method since it is
+ overriding its default value.
+
+ *Brendon Murphy*, *Doug Cole*
+
* Add `params` option to `button_to` form helper, which renders the given hash
as hidden form fields.