Is the "source" top-level field valid OpenAPI?

[timburks]

I noticed some specs have a top-level field called "source" (example).

That spec has an openapi value of 3.0.0 and I don't see a source property in the 3.0.0 spec or the 3.1.0 spec. I could be missing it but wonder if this might be something from the Discovery-to-OpenAPI translator that accidentally slipped through.

[MikeRalphson]

Thanks, this is something that's going wrong post-validation, I'll take a look.