Hi,

while working on some XML data extraction I got an NPE which boiled down to 
calling some zipper related functions on an empty vector or nil.  

I didn't find a function in clojure.zip, clojure.data.zip or 
clojure.data.zip.xml to test if an object passed to a function is actually 
a zipper.  Am I missing something obvious?  How would you test this?  I 
could try to call clojure.zip/node and catch the exception, but maybe there 
is a better aproach.


Kind regards,
stefan

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