Better string representation for TypeSeq used as function arg type?

[Shriramana Sharma via Digitalmars-d]

Hello. By executing the following:

alias AS = AliasSeq!(int, double);
int foo(AS td)  // same as int foo(int, double);
{
    writeln(typeof(td).stringof);
    return td[0] + cast(int)td[1];
}

I get:

(int, double)

But it is not very clear as to what exactly the type of `td` is! I 
understand that the AliasSeq is presented to the function body *as if* it 
were a Tuple!(int, double) in that it can be accessed using [0] [1] etc, but 
it is not *really* (in the sense of RTTI) a Tuple, is it? In which case, 
what is it? Is it another "Voldemort" type?

-- 
Shriramana Sharma, Penguin #395953