MethodHandle cast return type

I try to link methods together through methodhandles, some of them are from generic types. If a function returns a generic type I have to specify Object.class for the MethodType but I see no easy way to convert it back into the generic type parameter type. In most cases it's no problem because invoke seem to convert them automatically but I must create mhs which could be run with invokeExact. Is there no easy way to cast with methodhandles?

My testcode:

public static void main(String[] args) throws Throwable {    class Prefixer {        public static String prefix(String s) {            return "Number: " + s;        }    }    IntFunction<String> converter = Integer::toString;    var lookup = MethodHandles.lookup();    var prefixMH = lookup.findStatic(Prefixer.class, "prefix", MethodType.methodType(String.class, String.class));    var converterMH = lookup.findVirtual(IntFunction.class, "apply", MethodType.methodType(Object.class, int.class));    converterMH = converterMH.bindTo(converter);    /* Doesn't work because converter is a (int)Object and no (int)String    var mh = MethodHandles.filterArguments(prefixMH, 0, converterMH);     */    /* Does work for invoke but not for invokeExact    var prefixCasted = MethodHandles.explicitCastArguments(prefixMH, MethodType.methodType(String.class, Object.class));    var mh = MethodHandles.filterArguments(prefixCasted, 0, converterMH);    */    /* Does work for invoke but not for invokeExact */    var mh = MethodHandles.filterArguments(prefixMH, 0, converterMH.asType(MethodType.methodType(String.class, int.class)));    System.out.println(mh.invoke(12));    System.out.println(mh.invokeExact(42));}