Based on my reading of Continuation Frames and Marks <https://docs.racket-lang.org/reference/eval-model.html#(part._mark-model)>, any value at all can be used as a key for a continuation mark. So why does make-continuation-mark-key <https://docs.racket-lang.org/reference/contmarks.html#%28def._%28%28quote._~23~25kernel%29._make-continuation-mark-key%29%29> exist, and why is there a special continuation-mark-key <https://docs.racket-lang.org/reference/contmarks.html#%28def._%28%28quote._~23~25kernel%29._continuation-mark-key~3f%29%29> data type? Couldn't you use any arbitrary gensym, or a singleton struct? The docs for make-continuation-mark-key mention that the returned key can be impersonated and other kinds of keys can't, but they don't explain why that would be the case.
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