Behaviour of test -v with assoc array and quote character in key

[Daniel Gröber]

Hi list,

I've found what I belive to be a bug in how `test -v` expands the key in an
associative array. The following minimal test case demonstrates the
problem:

    declare -A array
    
    mytest () {
            array["$1"]=123
            test -v array["$1"]
            printf 'test -v array[%s]; $?=%s\n' "$1" "$?"
    }
    
    mytest 'a' # prints: test -v array[a]; $?=0
    mytest '"' # prints: test -v array["]; $?=1
    echo "keys: ${!array[*]}" # prints: keys: " a

With a regular alphanumeric key `test -v` will return zero, indicating the
array element exists. However if we specify a variable that expands to
something containing the double quote character the test doesn't succeeed
indicating the key doesn't exist though it does as we can observe by the
expansion of ${!array[*]}.

Do you think this intended behaviour or a real bug?

Tested on Debian buster, with bash_5.0-4 ($BASH_VERSION="5.0.3(1)-release")
and git master commit 76404c85d492c001f59f2644074333ffb7608532.

Thanks,
Daniel

PS: Please keep me in CC as I'm not subscribed.