Currently, goswagger OAS v2.0 structures are used to store spec information - both provided and reconstructed. In order to get full support for OAS v3.0, need to move to V3 structures (e.g. https://github.com/getkin/kin-openapi/tree/master/openapi3). To support older versions, we can use converters such as https://github.com/LucyBot-Inc/api-spec-converter, that can be executed using CLI, for example if the user provided a V2 spec that need to diff against.

Alternatives:
Keep the current goswagger OAS v2.0 structures and use converters such as https://github.com/getkin/kin-openapi/tree/master/openapi2conv to to generate the V3 spec. This is less preferred because if the traffic was according to V3 spec, the reconstruction will be lossy.