[flash] unexpected runtime error with abstract and inlining

[mandel59]

This code reproduce the issue where it is compiled into SWF.
Expected: a.g(0) returns the same value as a.f(0)
Result: a.g(0) throws TypeError: Error #1006

abstract A(String)
{
        public inline function new(s : String)
        {
                this = s;
        }

        public function f(index : Int) : Int
        {
                return StringTools.fastCodeAt(this, index);
        }

        public inline function g(index : Int) : Int
        {
                return StringTools.fastCodeAt(this, index);
        }
}

class Test
{
        public static function main()
        {
                try {
                        var a = new A("a");
                        trace(a.f(0));
                        trace(a.g(0));
                } catch (e : Dynamic) {
                        trace(e);
                }
        }
}