What is the commonly accepted technique for declaring/using 'supplied-p' 
type lambda list functionality in clojure?

http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_3-4-1.html


I have some clojure functions with a large number of keywords and various 
defaults, I want to know if a keyword was specified by the caller (rather 
than defaulted) in some cases.

Certainly I could implement my own destructuring macros that did this, but 
I'd like to avoid reinventing a wheel here if I can, and also to know the 
idiomatic clojure way to do it.

Thanks for any tips.


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