How changes in an associate array affect the iteration of its keys?

[Peng Yu]

Hi,

declare -A x=(
    [a]=
    [b]=
    [c]=
)
for k in "${!x[@]}"; do
    echo "==> $k <=="
    unset x[$k]
    declare -p x
    if ((++i==1)); then
        x[x]=
    fi
done
# output
==> c <==
declare -A x=([b]="" [a]="" )
==> b <==
declare -A x=([x]="" [a]="" )
==> a <==
declare -A x=([x]="" )

I have the above bash code. In this example, the changes to the
associative array x within the loop does not affect the enumeration of
the keys of x?

Is it always the case?

-- 
Regards,
Peng