Issue with 'key' for associative arrays

[Frans de Boer]

LS,

Unless I have not read the manual properly, bash has an issue with the 
key part used to address a value within associated arrays. I tried this 
in the bash 4.4.x and 5.x series of bash under OpenSUSE 15.2 and TW.

Addressing associative arrays with an array statement - like echo 
${k["${a[x]}"] does not work.
The resulting data from ${a[x]} is technical a string, but is not 
treated as such when using  an associative array. Instead, one should 
first copy the contents of the indexed ${a[x]} array  to an ordinary 
shell variable and then use this variable as the key in an associative 
array.

Next a script to clarify my point:
! /bin/bash

declare -A  k
declare -a  a
declare -i  i=2
declare     sString="devel packager's guide"

k["$sString"]=$i
a[$i]=$sString

echo ${k["$sString"]}
echo ${a[$i]}

unset -v 'k["${a[$i]}"]' # does not work
echo ${k["$sString"]}

sTemp=${a[$i]}
unset -v 'k["$sTemp"]'   # does work
echo ${k["$sString"]}

unset -v a[$i]

Is this an intended feature or a possible bug?

--- Frans.

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