MaybeReference

This is a utility crate that establishes an enum to use to match a JSON value that may be a single string (a "reference"), a reference in the form of {"id": "reference"} or an object.

"https://example.com/id/uuid"

{"id": "reference"}

{"id": "reference", "content": "somecontent"}

These would all match to MaybeReference<String> as ::Reference, ::Identifier, ::Actual, respectively.