they obviously just use the library because they don't understand variables in the first place. So "going meta" on variables is this mirage of learning something about them which isn't there. I feel we're doing a disservice to learners by providing it.
AFAIK no popular professional PL lets you do that - for good reasons. So, it's not even something that would help find your way around Java, Python, JavaScript, C, Ruby, whathaveyou.