lib/action_controller/metal/params_wrapper.rb in actionpack-5.0.4 vs lib/action_controller/metal/params_wrapper.rb in actionpack-5.0.5.rc1

@@ -277,9 +277,9 @@
       # Checks if we should perform parameters wrapping.
       def _wrapper_enabled?
         return false unless request.has_content_type?
 
         ref = request.content_mime_type.ref
-        _wrapper_formats.include?(ref) && _wrapper_key && !request.request_parameters[_wrapper_key]
+        _wrapper_formats.include?(ref) && _wrapper_key && !request.request_parameters.key?(_wrapper_key)
       end
   end
 end