[Question] Is encoding.Stringify required?

I'm curious if use of `encoding.Stringify` is actually required.

I was having issues with contract tests failing due to Request/Response not matching. Digging into that issue I found several bugs in Stringify:
- integers quoted in the Response
- nested structs not honoring the `omitempty` tag

As a work around I commented out the use of Stringify in `cfn.newResponse` and everything works- that leads me to wonder why Stringify exists.