What tools exist in Clojure for understanding whether a given variable is
boxed or primitive?

To get a better handle on boxing, I started playing around with things like:

(def x 1)
(def ^int x 1)
(def x (int 1))

I want to know how Clojure is storing that 1 in the various cases.

The only tool I know of to investigate the type of an object is to call
(type x), but type always reports things as boxed, so it is of no help
whatsoever.

How does one go about investigating this?

To be clear, I care less about the actual (def x ...) examples above
(although if you want to comment about that, that's certainly helpful).
I'm mostly concerned with figuring out how I can explore these issues on my
own.

Thanks,

Mark

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