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Personally, I prefer to always have the response wrapped.
First, it makes it easier to extend in the future without breaking things.
I have been around long enough, that code I wrote in the 1980s is still being used today!
And the hardest thing to adjust is the data structure changes, because it impacts everything!
Next, it just seems more consistent to always be wrapped. I could be biased by using a system or two that were always wrapped. And their inner objects were always consistent objects, and moveable between other container objects.
".45 ACP - because shooting twice is just silly" - JSOP, 2010 ----- You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010 ----- When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013