Allow raw resources where Reference-s are used too

[aartaka]

So I'm working on a CCDA to FHIR converter, which recursively parses CCDA resources and generates a nested tree of FHIR resources. Which was fine in a previous implementation, because it was untyped. But now that I'm using generated TypeScript bindings, they mandate that nested resources should be Reference-s instead:

export interface Observation extends DomainResource {
    // ...
    partOf?: Reference<'ImagingStudy' | 'Immunization' | 'MedicationAdministration' | 'MedicationDispense' | 'MedicationStatement' | 'Procedure'>[];
    performer?: Reference<'CareTeam' | 'Organization' | 'Patient' | 'Practitioner' | 'PractitionerRole' | 'RelatedPerson'>[];
    // ...
}

Meaning I should somehow store resources somewhere instead of recursively including them in the tree. Which most likely means global state, and global state is not nice. Is there any possibility that you may allow raw resources in addition to Reference-s in the fields where nested resources are included?