test -v difference between bash 5.1 and 5.2

[Christian Schneider]

Hi all,

not sure if this intended or not, but in bash 5.2-p15 one of our scripts 
is broken. it is related to test -v, that checks, if a variable is set 
together with arrays.

I condensed it to following example:
#!/bin/bash

declare -A foo
foo=(["a"]="b" ["c"]="d")
declare -a bar
bar=("a" "b" "c")
declare -a baz
baz=("foo" "bar")
for i in "${baz[@]}" ; do
        echo $i
        if [ ! -v "$i"[@] ] ; then
                echo "$i not set"
        fi
done
--------

with bash 5.2-p15 the output of this script is
foo
foo not set
bar

so, it doesn't work with associative arrays.
Instead, with 5.1-p16 the output is
foo
bar

so, in 5.1-p16 test -v with associative array works, but not with 5.2-p15.

I don't know, if this an intended change, so please can you take a look?
If it is intended, can you please explain, why this was changed, and if 
there is an alternative for associative arrays?

BR, Christian

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