class Foo
{
    static { loadLibrary("ani_op");}

    native CallMeWithOptionalDouble(para?:double):void
    native CallMeWithOptionalString(str?:string):void
}

function main(){
    let f = new Foo;
    f.CallMeWithOptionalDouble();
    f.CallMeWithOptionalDouble(42.0);
    f.CallMeWithOptionalString();
    f.CallMeWithOptionalString("Hey");
}