ActionScript 3.0 :: Running Function On Non-typed Non-movie Clip Object

I am loading various swf library component/classes during run time. All of these components have the function 'remove()' in them. Not all of these components are MovieClips, many extend Sprite instead. I have them in an array that I loop through and call remove() on each of them.

I would like to keep strict mode on if at all possible:

Usually I can just do this

Code:
for(i=0;i<a.length;i++)
{
MovieClip(i).remove();
}

but I am wondering what happens if I type a class that extends Sprite as a MovieClip to avoid the compile time error in order to call the remove function on it?

remove() does things like remove all listeners, stop sounds playing etc and finally parent.removeChild(this);