output of `export -p' seems misleading

[wuya]

Hi all,
   1. why `export -p' output something in the format `declare -x foo="bar"'
   2. this format gives user an implication that by executing these `declare' 
commands, all those variables got exported, but this is only partly true as it 
fails in functions.
   3. As in bash 4.2, -g option is added. why not change output format of 
`export -p' to `declare -g foo="bar"'?

thanks!