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kotlinlang

Hi, I was wandering if the `OpenApi3ApiRenderer` should render or not null values giving that <https://swagger.io/specification/#data-types|OpenAPI specification clearly states> that
&gt; `null` is not supported as a type.
Ok you can disable null from Json but it's not the default, requires a custom config, but I think the OpenApi3Renderer should (at least by default) follow to the specifications of the format it claim to render. Don't you think ?

We just need to create a Jackson instance to put into it by default. Feel free to PR it. :slightly_smiling_face:

Ok, wanting your opinion first. The problem is that It's supposed to work with other libs not just Jackson so I guess it should be done somewhere in the renderer. I'll try to poke around.

There's a set of defaults for use specifically with Jackson. Think it's JacksonExt.kt or similar

I was thinking that OpenApi3ApiRenderer is the place as it's that specific specification that requires that. Just like another one I just saw as invalid and cannot be fixed with just a Jackson config: `required` list in an object schema must not be empty. It's Ok to not have the key but if you have it it must have at least one element.