[Xmonad] Docks and things

Is XMonad intended to respect _NET_WM_WINDOW_TYPE_DOCK? I note that when I start applications like kicker, gkrellm, etc., (which xprop says have _NET_WM_WINDOW_TYPE(ATOM) = _NET_WM_WINDOW_TYPE_DOCK) they sort of get managed (xmonad gives them a suitable managed window, though often it's blank (because the application's drawn itself elsewhere)). Shouldn't xmonad just ignore such client windows?