GenericStackをTypeParameter混じりのstaticな関数として扱うと、関数参照を渡せなくなる

import haxe.ds.GenericStack;
class Test 
{
    var arrayFunctionHolder:Array<String> -> Void;
    var stackFunctionHolder:GenericStack<String> -> Void;

    static public function arrayFunction<T>(param:Array<T>):Void
    {
    }

    static public function stackFunction<T>(param:GenericStack<T>):Void
    {
    }

    static public function stackFunction2(param:GenericStack<String>):Void
    {
    }

    public function new()
    {
        arrayFunctionHolder = arrayFunction;    // ok
//      stackFunctionHolder = stackFunction;    // error...
//      stackFunctionHolder = stackFunction<String>;    // error...
//      stackFunction<String>(new GenericStack<String>());  // error...
        stackFunction2(new GenericStack<String>()); // ok
        var hoge:Hoge<String> = new Hoge(stackFunction);    // ok...
    }
}
class Hoge<T>
{
    public var hoge2:Hoge2<T>;
    public function new(func:GenericStack<Hoge2<T>> -> Void) 
    {
        hoge2 = new Hoge2<T>();
    }
}
class Hoge2<T>
{
    public var stackFunctionHolder:GenericStack<T>;
    public function new() 
    {
    }
}