[flexcoders] not legal to override a function with an optional parameter, e.g. foo(s: String=null) ?

[Tim Romano]

I've been asking general questions about inheritance and am splitting 
this question off as a separate one because it's very specific.

It appears that you cannot override a function with optional parameters?

protected function foo(a:String, s:String=null): void {}

Isn't the signature considered the same if you do this?

override protected function foo(a:String, s:String=null): void{}


Thanks

Tim