TYPEMAP
int64_t                T_INT64
uint64_t               T_UINT64
Digest::HighwayHash    T_PTROBJ

INPUT
T_INT64
        $var = SvI64($arg);

T_UINT64
        $var = SvU64($arg);

OUTPUT
T_INT64
        $arg = newSVi64($var);

T_UINT64
        $arg = newSVu64($var);