Dynamic Schema Does Not Resolve Correct Type for property `_services` (Federation Subgraphs)

[nickisyourfan]

Expected Behavior

Subgraph introspection of a federated server built with dynamic schema returns type _Service.

Actual Behavior

Subgraph introspection of a federated server built with dynamic schema returns type String.

Steps to Reproduce the Problem

1. Use dynamic schema.
2. Enable Federation.
3. Use Rover CLI to create supergraph -or- introspect the subgraph.
   • rover supergraph compose http://localhost:5000
   • rover subgraph introspect http://localhost:5000
4. Field _service returns sdl as type String causing subgraph introspection error. Note, regular introspection is valid using rover graph introspect http://localhost:5000

_service: "..."  

5. It should return type _Service instead, which is an object that contains the property sdl as a string.

_service: {
  sdl: "..."
}

Specifications

• Version: async-graphql = { version = "5.0.5", features = ["dynamic-schema"] }
• Platform: Linux, Pop OS 22.04 LTS
• Subsystem:

[bbigras]

Can this issue be closed now?

[nickisyourfan]

This PR did provide the fix for me. @bbigras

Would you like that I hit the close button or would you like an official contributer to close this?