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kotlinlang

you'd end up with ```  {
            "in": "body",
            "name": "body",
            "required": true,
            "schema": {
              "$ref": "#/definitions/someOtherDefinitionId"
            },
            "description": "the body of the message"
          }```

in this method: <https://github.com/http4k/http4k/blob/69e45034785f28c3c77f2ffad8188d9e603ec991/http4k-contract/src/main/kotlin/org/http4k/contract/OpenApi.kt#L56>

`type` should always be a child of `schema`

currently if schema is `null` this code will render `type` like this

```{
	"in": "body",
	"name": "body",
	"required": true,
	"type": "object",
	"description": "Some JSON"
}```

<https://github.com/http4k/http4k/issues/198>