function arguments

function Foo(f) {
   var f = f;    
}

Here inside the function, variable f is local to the Foo (it has a function scope), but why is the variable f in the argument list not in conflict? Maybe because it is bound inside the Foo.arguments object?

In other languages we cannot declare an argument variable with the same name as a local variable.

How is this name ambiguity resolved? Or, How do you reference each of the two distinct f variables later in the method?