exportc pragma and ref object

[jdn]

When I compile the following code: 
    
    
    import strutils
    
    type
      Token {.exportc.} = object
        typ: cint
        val: cstring
    
    proc exportc(a: Token) {.exportc.} =
      let msg = "Token (type, value): ($1, $2)" % [$a.typ, $a.val]
      echo msg
    
    
    Run

with 
    
    
    nim c --header exportc.nim
    
    
    Run

I get a header file with the following snippet: 
    
    
    typedef struct Token Token;
    struct Token {
    int typ;
    NCSTRING val;
    };
    N_NOCONV(void, signalHandler)(int sign);
    N_NIMCALL(NI, getRefcount)(void* p);
    N_NIMCALL(void, exportc)(Token a);
    N_CDECL(void, NimMain)(void);
    
    
    Run

which is what I expect and can then call from a c main function. However, if I 
change the object to a ref object
    
    
      Token {.exportc.} = ref object
        typ: cint
        val: cstring
    
    
    Run

I get a header file with the following: 
    
    
    typedef struct tyObject_TokencolonObjectType___My6xn9bSiVikjAjVy7Y8xcA 
tyObject_TokencolonObjectType___My6xn9bSiVikjAjVy7Y8xcA;
    N_NOCONV(void, signalHandler)(int sign);
    N_NIMCALL(NI, getRefcount)(void* p);
    N_NIMCALL(void, 
exportc)(tyObject_TokencolonObjectType___My6xn9bSiVikjAjVy7Y8xcA* a);
    N_CDECL(void, NimMain)(void);
    
    
    Run

So for a ref object the exportc pragma doesn't stop name mangling which makes 
calling from c a pain. Is this a bug or is there something about reference 
objects I'm not comprehending.

Thanks,

Jason