When a polymer element is already imported, importHref does not fire the ok function

[TipzCM]

In Polymer.java:

public static void importHref(String hrefOrTag, final Function ok, final Function err) {
    final String href = absoluteHref(hrefOrTag);
    if (!urlImported.contains(href)) {
        urlImported.add(href);
        whenPolymerLoaded(new Function() {
            public Object call(Object arg) {
                Base.importHref(href, ok, err);
                return null;
            }
        });
    }
}

The problem i see is that if urlImported already has the imported elements, the ok function is not fired, necessitating a manual check for the element (essentially isRegistered, which is private).

Or maybe i'm going about this all wrong. How do i know if a polymer element has been imported into gwt?