Incompatible override when calling private super function

[Warren Eng]

I've encountered a peculiar behavior when generating AS3 source. When I override a private function and call its super function, the super class' function signature becomes public. I expect it to be protected. This causes a compile-time error:

Error: Incompatible override.

Here's a test case to reproduce the problem:

package;
class Foo
{
   public function new()
   {
   }

   private function someFunc():Bool
   {
      return false;
   }
}

package;
class Bar extends Foo
{
   public function new()
   {
   }

   private override function someFunc():Bool
   {
      return super.someFunc();
   }
}

The net result is that Foo now has:

public function someFunc():Bool
{
   return false;
}

...and Bar now has:

protected override function someFunc():Bool
{
   return super.someFunc();
}

Can anyone shed some light on what's going on here? Why does calling super.someFunc() modify the access to the parent class' someFunc()?