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#ifndef RBIGNUM_SIGN  // Ruby 1.8
#define RBIGNUM_SIGN(b) (RBIGNUM(b)->sign)
#endif

static VALUE MessagePack_Bignum_to_msgpack(int argc, VALUE *argv, VALUE self)
{
  ARG_BUFFER(out, argc, argv);
  // FIXME bignum
  if(RBIGNUM_SIGN(self)) {  // positive
    msgpack_pack_uint64(out, rb_big2ull(self));
  } else {  // negative
    msgpack_pack_int64(out, rb_big2ll(self));
  }
  return out;
}