[DGD] Does object_name() not like mixed or...?

[Robert Forshaw]

Here's my function (it masks object_name()):

static nomask string object_name(mixed obj, varargs int master, int shed)
{
    if(!obj) return nil;

    if(IS_OBJECT(obj))
          obj = ::object_name(obj);
    else
      {
          obj = ::find_object(obj);
          obj = ::object_name(obj);
      }


    if(master)
          sscanf(obj, "%s#",obj);

    if(!obj || obj == "")
          return nil;

    if(!shed)
          return obj;

              /* shed the filename */
    obj = explode(obj, "/");
    obj = obj[..sizeof(obj) - 2];
    obj = "/" + implode(obj, "/") + "/";
    return obj;
}

It keeps failing on the 10th line (obj = ::object_name(obj);).

With the runtime error: "Bad argument 1 for kfun object_name"

Why?

Under the conditions I've set down it should only ever be called with a 
mixed variable pointer to an object.

Incidently, those two functions were originally on the same line like this:

obj = ::find_object(::object_name(obj));

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