"Placeholder" variables currently can be displayed if they have an attribute (iaArn) (1). Could there be a consideration for a behavior change/feature to display them by name and prefix (2)(3)?
For illustration purposes: 1) declare -i var; declare -pi 2) declare -i var; declare -p var 3) declare -i var1= var2; declare -p ${!var*} where the option 'i' above could be 'iaAnr' (1)(2)(3) and with the additional '-' in (2)(3). Peggy Russell