lib/hanami/extensions/action/slice_configured_action.rb in hanami-2.0.0.rc1 vs lib/hanami/extensions/action/slice_configured_action.rb in hanami-2.0.0

@@ -58,11 +58,11 @@
             #
             # For example, given an app-level base action class, with custom config:
             #
             #   module MyApp
             #     class Action < Hanami::Action
-            #       config.default_response_format = :json
+            #       config.format :json
             #     end
             #   end
             #
             # And then an action in a slice inheriting from it:
             #
@@ -89,10 +89,13 @@
             slice_value = slice.config.actions.public_send(setting.name)
             parent_value = slice.parent.config.actions.public_send(setting.name) if slice.parent
 
             next if slice.parent && slice_value == parent_value
 
-            action_class.config.public_send(:"#{setting.name}=", slice_value)
+            action_class.config.public_send(
+              :"#{setting.name}=",
+              setting.mutable? ? slice_value.dup : slice_value
+            )
           end
         end
 
         def extend_behavior(action_class)
           if actions_config.sessions.enabled?