Following is a example of me specifing a Endpoint as i usually do, but i recognized a situation that i cant explain myself.

In the First example i specify the delagete abcDelegate and use it in the .MapGet where i expect to use this Signature: With the Delegate not the RequestDelegate!

 public static RouteHandlerBuilder MapGet(
     this IEndpointRouteBuilder endpoints,
     [StringSyntax("Route")] string pattern,
     Delegate handler)

Works but is unecesary long with the delegate not as a lamda

internal sealed class CheckMailStatus : IEndpoint
{

  private static async Task abcDelegate(string id, IEmailRepository emailRepository)
  {
    IEnumerable a = await emailRepository.GetAllAsync();
    InternalGenericEmail? result = a.FirstOrDefault(p => p.Id.ToString() == id);
    if (result is not null)
    {
      return TypedResults.Ok(result);
    }
    return TypedResults.NotFound($"Die angegebne Id: {id} ist nciht vorhanden");
  }
  public void MapEndpoint(IEndpointRouteBuilder app) => app.MapGet("api/notifier/generic/check/{id}", abcDelegate);
}

When the delegate is declared inline the issue Delegate "RequestDelegate" does not take 2 arguments apear.

internal sealed class CheckMailStatus : IEndpoint
{
  public void MapEndpoint(IEndpointRouteBuilder app) => app.MapGet("api/notifier/generic/check/{id}", async (string id, IEmailRepository emailRepository) =>
  {
    IEnumerable a = await emailRepository.GetAllAsync();
    InternalGenericEmail? result = a.FirstOrDefault(p => p.Id.ToString() == id);
    if (result is not null)
    {
      return TypedResults.Ok(result);
    }
    return TypedResults.NotFound($"Die angegebne Id: {id} ist nciht vorhanden");
  }
    );
}

I thought that those two exmaple are Equal in function or does the MapGet not support the Delegate as a Lambda?