Bash -v test doesn't work with associative arrays in 4.3.46

The -v unary operator that was introduced in version 4.2 to test if a variable is set or not does not appear to work in bash 4.3.46 on associative arrays. I have some bash test code that I run against a set of bash functions, and they all pass in bash 4.2 (on CentOS 7.1). I recently booted up a Lubuntu 16.04.1 distro and noticed a good portion of my tests now failed, with bash 4.3.46. It seems like all of the failures are due to code like this: function is_var_set { local var="${1:?"No var provided to 'is_var_set'!"}" [[ -v "$var" ]] } declare -A array=(["a"]="element 1") is_var_set "array" Is this a widely known thing/was support removed for associative arrays?