Problem/Motivation
In #2835767: Deal with Media and REST/normalizers: opt out Media & Media Type entity types from REST support, we excluded the Media module's entities from being exposed as REST resources. We did that because while a lot of effort had been put in making sure the Media entity was rock solid for 8.4.0, no attention had been paid at all yet to the normalization (and serialization) of Media entities.
Rather than causing regressions and BC breaks in the future by needing to fix the normalizations of the Media module's entities, we chose to limit the API surface. Which means we'll be able to ship a well-considered normalization of Media & Media Type entities, and not cause BC breaks.
Proposed resolution
TBD
Remaining tasks
User interface changes
None.
API changes
None: only API addition.
Data model changes
None.