discuss: refs in discriminator object

[jgresty]

I have noticed that while the upstream openapi 3 spec for discriminator object specifies the data type is Map[string]string, in their written examples they use refs: https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#discriminator-object

While this library sticks to the literal spec type definition, we have noticed many real world specs which do accept refs in this field. Since even the upstream spec is not well defined here perhaps this library should be more lax?

Curious to hear opinions about this. I have also raised an issue upstream about this: OAI/OpenAPI-Specification#4138

[jgresty]

So from upstream the typing is correct as reference objects also use type string for their referenced strings.

In this case I think the discriminator mapping object needs to be considered in functions such as InternalizeRefs and Validate