static O quickExport(O o, O dest) ctex {
  ret quickExport_impl(o, dest, new IdentityHashMap);
}

static O quickExport_impl(O o, O dest, IdentityHashMap seen) ctex {
  if (o == null || o instanceof String || o instanceof Number) return o;
  
  O oo = seen.get(o);
  if (oo != null) ret oo;
  
  if (o instanceof O[]) {
    O[] l = (O[]) o;
    O[] destO = new O[l.length];
    seen.put(o, destO); 
    for (int i = 0; i < l.length; i++)
      destO[i] = quickExport_impl(l[i], dest, seen);
    ret destO;
  }
  
  if (o instanceof List) {
    List l = cast o;
    List destO = new ArrayList(l.size());
    seen.put(o, destO); 
    for (int i = 0; i < l.size(); i++)
      destO.add(quickExport_impl(l.get(i), dest, seen));
    return destO;
  }
  
  if (o instanceof Map) {
    Map m = cast o;
    Map destO = new HashMap();
    seen.put(o, destO);
    for (Object e : ((Map) o).entrySet())
      destO.put(
        quickExport_impl(((Map.Entry) e).getKey(), dest, seen),
        quickExport_impl(((Map.Entry) e).getValue(), dest, seen));
    return destO;
  }
  
  S className = o.getClass().getName();
  if (className.startsWith("main$") && !isAnonymousClassName(className)) {
    Class destClass = getClass(dest, className);
    if (destClass == null) ret o; // Class not found in target realm, keep object as is
    
    //print(o.getClass() + " => " + destClass);
    
    if (o.getClass() == destClass)
      return o; // no export necessary
      
    // actually make a new object, copy fields
    
    O destO = nuObject(destClass);
    seen.put(o, destO);
    
    Class c = o.getClass();
    while (c != O.class) {
      Field[] fields = c.getDeclaredFields();
      for (Field field : fields) {
        if ((field.getModifiers() & Modifier.STATIC) != 0)
          continue;
        field.setAccessible(true);
        Object value = field.get(o);
        setOpt(destO, field.getName(), quickExport_impl(value, dest, seen));
      }
      c = c.getSuperclass();
    }
    
    return destO;
  }
  
  // assume it's a shared library object
  ret o;
}