Treat oneOf(a, null) as optional

[cbndr]

Would it be possible to treat a oneOf of 2 types where one is null as optional? Example:

          "oneOf": [
            {
              "type": "integer",
              "format": "int32"
            },
            {
              "type": "null"
            }
          ]

currently generates an interface{} type in Go. IMO it would be preferable to generate a *int instead. I know this could be coded differently in JSON schema to generate the desired output, but unfortunately, the schema is not under our control.