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GNU `bash`
==========
(Associative) arrays
--------------------
### Expansion
#### Do
func ${arr[@]+"${arr[@]}"}
#### Don't
func "${arr[@]}" # Doesn't work with `nounset`.
func "${arr[@]+"${arr[@]}"}" # Doesn't work properly with `declare -a arr=('')`.
### `unset`
#### Do
unset -v 'arr[$i]'
#### Don't
unset -v arr[x] # May break due to globbing.
unset -v arr[$i] # The same as above + possibly a pair of quotes is
# missing.
unset -v 'arr["x"]' # Doesn't work for some reason.
unset -v 'arr["]"]' # The same as above; just highlighting the problem
# with funny characters in array indices.
# An insightful discussion: https://lists.gnu.org/archive/html/help-bash/2016-09/msg00020.html.
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