Oh, it seems set -u was fixed with regards to arrays in 2011 or so: https://stackoverflow.com/questions/7577052/unbound-variable-error-in-bash-when-expanding-em

Oh, it seems set -u was fixed with regards to arrays in 2011 or so: https://stackoverflow.com/questions/7577052/unbound-variable-error-in-bash-when-expanding-empty-array https://stackoverflow.com/questions/7577052/unbound-variable... Maybe I can start using it again. (I think I noticed that issue while I was at Google, and they used an older version of Bash.)