Cannot fix covariant return of an interface

[jpobst]

Context: xamarin/GooglePlayServicesComponents#404

Given this construct:

public interface IProvider {
  Java.Lang.Object Get ();
}

public class ProviderOfLazy : IProvider {
  public ILazy Get () { ... }
}

Initially you will get an error that this doesn't count as the implementation because of covariant return types.

If you try to do the usual fix of changing ProviderOfLazy.Get to return JLO, then you get a different error because ILazy in an interface, which does not inherit JLO:

return global::Java.Lang.Object.GetObject<global::Com.Google.Firebase.Inappmessaging.Dagger.ILazy> 
(__rm.Handle, JniHandleOwnership.TransferLocalRef);

error CS0266: Cannot implicitly convert type 'Com.Google.Firebase.Inappmessaging.Dagger.ILazy' to 
'Java.Lang.Object'. An explicit conversion exists (are you missing a cast?)

This could potentially be fixed by casting to JLO, since we "know" the object will be a JLO.

return (Java.Lang.Object) global::Java.Lang.Object.GetObject
<global::Com.Google.Firebase.Inappmessaging.Dagger.ILazy> 
(__rm.Handle, JniHandleOwnership.TransferLocalRef);