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This replaces the mapfile + bash array code with a simple pipe into a while loop and simplifies the logic a bit. It also makes the script more portable. The only remaining bashism is the pair of echo -e "$options" calls, which can be replaced with a slightly uglier printf "$options" if posix compatibility is desired. Then the script runs fine on dash.
It is possible to use (for example) /bin/dash now as /bin/sh
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Replaces #30, because bloody GitHub cannot do proper stacked PRs.