uint64_t     T_U_LONG64
uint32_t     T_U_LONG32

INPUT
T_U_LONG64
    $var = (uint64_t) exs_SvUV($arg)

T_U_LONG32
    $var = (uint64_t) exs_SvUV($arg)
    if ($var > UINT32_MAX) croak("%" UVuf " exceeds U32 max (%u)", $var, UINT32_MAX);

OUTPUT
T_U_LONG64
    sv_setuv($arg, (UV)$var);

T_U_LONG32
    sv_setuv($arg, (UV)$var);
