table_is_an_array BUG

int table_is_an_array(lua_State *L) {
int count = 0, max = 0;
#if LUA_VERSION_NUM < 503
lua_Number n;
#else
lua_Integer n;
#endif

/* Stack top on function entry */
int stacktop;

stacktop = lua_gettop(L);

lua_pushnil(L);
while(lua_next(L,-2)) {
/* Stack: ... key value */
lua_pop(L,1); /* Stack: ... key */
/* The <= 0 check is valid here because we're comparing indexes. */
#if LUA_VERSION_NUM < 503
if ((LUA_TNUMBER != lua_type(L,-1)) || (n = lua_tonumber(L, -1)) <= 0 ||
!IS_INT_EQUIVALENT(n))
#else
if (!lua_isinteger(L,-1) || (n = lua_tointeger(L, -1)) <= 0)
#endif
{
lua_settop(L, stacktop);
return 0;
}
max = (n > max ? n : max);
count++;
}
/* We have the total number of elements in "count". Also we have
* the max index encountered in "max". We can't reach this code
* if there are indexes <= 0. If you also note that there can not be
* repeated keys into a table, you have that if max==count you are sure
* that there are all the keys form 1 to count (both included). */
lua_settop(L, stacktop);
return max == count;
}

int count = 0, max = 0; this should be int64_t count = 0, max = 0;