How to get rid of this compiler warning?

I have a few classes (of TObject) in Delphi XE7 (Firemonkey) which have a property AsJson:

uses
  System.Classes, System.SysUtils, XSuperObject;

type
  TMyObject = class(TObject)
  public
    property AsJson: ISuperObject read GetAsJson;
  end;

However, the compiler is giving me warnings for these:

[dcc32 Warning] MyUnit.pas(383): W1009 Redeclaration of 'AsJson' hides a member in the base class

I'm looking in the base class of TObject and see no such thing, nor is it a valid field if I were to try to use it. I see nothing in the documentation about such a property. This only appears to happen if the property type is ISuperObject which is the latest version of XSuperObject (from SVN a few weeks ago at least). I also tried using type Integer and I get it too.

What does this warning mean in my scenario and how do I get rid of it?

EDIT

It appears to only happen when I have XSuperObject in the uses clause...

program Project1;

{$APPTYPE CONSOLE}

{$R *.res}

uses
  System.SysUtils,
  XSuperObject in 'C:\...\XSuperObject.pas',
  XSuperJSON in 'C:\...\XSuperJSON.pas';

type
  TMyObject = class(TObject)
  private
    FTest: Integer;
  public
    property AsJson: Integer read FTest;
  end;

begin

end.

Above example produces:

[dcc32 Warning] Project1.dpr(17): W1009 Redeclaration of 'AsJson' hides a member in the base class

If I simply remove XSuperObject, I don't get this warning. My copy of XSuperObject is a few weeks old.

In ten years, no proper answer has been provided. Here is how to get rid of that message:

TMyObject = class(TObject)
  public
{$WARNINGS OFF}
    property AsJson: ISuperObject read GetAsJson;
{$WARNINGS ON}
  end;