switch using a variable that can cast to both integer and string

[Tommi]

This bug report: 
http://d.puremagic.com/issues/show_bug.cgi?id=7979
... made me think about the following scenario:

struct MyStruct
{
     int    _intValue;
     string _strValue;

     alias _intValue this;
     alias _strValue this;
}

void main()
{
     auto ms = MyStruct(1, "two");

     switch (ms)
     {
     case MyStruct(1, "one"):
         // To be here...
         break;

     case MyStruct(2, "two"):
         // ... or here?
         break;

     default:
         // Not here though
     }
}

Should that switch statement:
a) Give an error saying "ms is neither integral nor string"
b) Cast its conditional- and case-expressions to int
c) Cast its conditional- and case-expressions to string

I understand multiple alias this statements will be possible at 
some point?