fix unpacking too many values, taken from existing PR-#123 #192
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Since there is no progress on #123 I created another PR.
FYI: The commit from @mattbornski was taken.
Since our queues stopped working if there are more than 8k jobs with the same timestamp, we needed a fix asap. I know that the PR was not merged since there could be a further improvements. However as @mattbornski mentioned, better this fix with blocking redis for short time than processing no jobs at all.
We are already using this code on our production system since we needed a fix asap.
Disclaimer: I'm not a lua programmer, so feel free to adapt the PR ;)