Support dynamicRef/Anchor

[Aweptimum]

I was looking into whether the spec supported generics, and I found this nifty article recently shared by henry andrews here

This has technically been a part of the spec for a while, but it's not documented. There is currently an open issue authored 2 months ago to document it OAI/OpenAPI-Specification#3601

I was wondering if swagger-php might be able to add support for it. Although I don't think swagger-codegen parses it, so this would just be a nice-to-have for if/when they do

[DerManoMann]

I always struggle with the specs - never quite sure if something is an OpenAPI thing or a JSON schema thing.
If it comes to it there is certainly scope for adding it. It might mean finally switching to a proper PHP parser and/or probably also a library to parse types.