typed Observable.zipN for input observables of same type

Observable#zipN.java

    
    @SuppressWarnings("unchecked")
    static <R, T> Observable<R> zip(Iterable<? extends Observable<T>> ws, Func1<List<T>, ? extends R> zipFunction) {
        FuncN<R> funcN = (Object[] array) -> {
            List<T> l = new ArrayList<T>();
            for (Object o : array) {
                l.add((T) o);
            }
            return zipFunction.call(l);
        };
        return Observable.zip(ws, funcN);
    }