Root level extensions excluded from merged file

[surfsoft]

OpenAPI supports extension points at a numbed of locations within an OpenAPI specification (see the docs at swagger.io for further details.

I've a pair of OpenAPI files, both with extensions at the operation level, and also at the root level. The root level extensions look something like this:

File 1:

x-myext-api
  service1:
    publish: true
    name: "Service 1"

File 2:

x-myext-api
  service2:
    publish: false

What I was hoping for was for swagger-combine to produce was this:

x-myext-api
  service1:
    publish: true
    name: "Service 1"
  service2:
    publish: false

What actually happens is that no part of either extension is included. My extensions at the operation level are carried through correctly.

Unsure if this is a bug, or should be classified as a feature request.