Support for partial inclusion of relationships

[caiotoon]

JSON:API has support for optional inclusion of related objects.

The specification states that in case the request has an explicit include directive, it MUST NOT include unrequested entities.

If an endpoint supports the include parameter and a client supplies it, the server MUST NOT include unrequested resource objects in the included section of the compound document.

The problem is that calling MarshalPayload will include all related items, whereas MarshalPayloadWithoutIncluded includes none.

It does not seem to be possible to support this use case with the current version of the library.