Abstract enum issue when nesting enums. Gives error message: Test.hx:5: characters 8-39 : AType<AType<Int>> should be A<A<Int>>

Test.hx

class Test {
    static function main(){
        var val0 : A<Int> = a(1); // This is fine.
        trace(val0);
        var val1 : A<A<Int>> = a(a(1)); // This fails.
        trace(val1);
    }
}
enum AType<T> {
    a(v : T);
}
abstract A<T>(AType<T>) from AType<T> to AType<T> {

    public function new(a : AType<T>) {
        this = a;
    }
}

Compile with haxe -x Test