Based on my reading of Continuation Frames and Marks 
any value at all can be used as a key for a continuation mark. So why does 
exist, and why is there a special continuation-mark-key 
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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