I agree. We ran into sev by changing the top level config object before. You DO NOT want to modify it. The wasted man hour is not worth. You will never know where or how it get used. If you make changes it's better to derive from it instead.

Update: What's funny was, in our design the config object was kinda immutable. You have to use the WARNING_DO_NOT_USE api to make modification. We did mutate the object and we caused a sev