Conform to EntityIdentifierConvertible

[magnusburton]

I tried implementing conformity to EntityIdentifierConvertible in AppIntents, but I couldn't make it work. I'd like to be able to do the following:

import Tagged
struct Route: Identifiable, Codable, Sendable {
	typealias ID = Tagged< Route, String>
	let id: ID
}

import AppIntents
struct RouteEntity: AppEntity, Identifiable {
	var id: Route.ID
	var name: String
	
	// ...
}

Now, as a work-around I define id in the entity as Route.ID.RawValue but that defeats the purpose a bit. What do you think?

[mbrandonw]

Does it help if you conditionally make Tagged conform to EntityIdentifierConvertible:

extension Tagged: EntityIdentifierConvertible where RawValue == String {
  public var entityIdentifierString: String {
    self.rawValue
  }
  public static func entityIdentifier(for entityIdentifierString: String) -> Tagged<Tag, RawValue>? {
    Tagged(entityIdentifierString)
  }
}

If this is the correct thing for us to do we could include it in the library.

Also, this is not really an issue with a library, and so I am going to convert this to a discussion. Feel free to continue the conversation over there.