print enum value rather name from enum X : string

[Marc via Digitalmars-d-learn]

If I have an enum like this:

enum S  : string {
        foo = "a",
        baa = "b"
}

when I printed it, to my surprise I get the enum field name 
rather value:

writefln("%s v%s", S.foo, S.baa);     

output:

foo vbaa

instead of

a vb

a cast solves it but without cast everywhere I need that enum 
member, is there any other way to do it? otherwise I'll have to 
switch to a class with static immutable strings, right?