What's the recommended way to iterate SCANs in Lua for Redis?

I've been looking around for the recommended way to iterate over SCANs using Lua and was wondering if there was a "best practice" so to speak for it. The script below was the best I could find so far. Does anyone have anything to add? Is it wise to iterate using COUNT 1000000000? Wouldn't that be blocking?

local ans, has, cursor = {}, {}, "0";
repeat
    local t = redis.call("SCAN", cursor, "MATCH", KEYS[1], "COUNT", 1000000000);
    local list = t[2];
    for i = 1, #list do
        local s = list[i];
        if has[s] == nil then has[s] = 1; ans[#ans + 1] = s; end;
    end;
    cursor = t[1];
until cursor == "0";
return #ans; --or return ans;

Taken from: https://github.com/antirez/redis/issues/3190#issuecomment-214022437