clojure.set/intersection appears to use the indexes of vectors as values. This results in very strange behavior if you accidentally end up passing a vector in as one of the arguments.
If any of the arguments are lists, you get a ClassCastException which is maybe a bit less clear than one would hope.
The same also happens if all arguments are lists:
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Andy Fingerhut July 31, 2018 at 1:09 AM
If you want an off-the-shelf compatible replacement for clojure.set functions that are identical in behavior, except they perform run-time type checks of the arguments you provide to them, and throw an exception if they have the wrong types (e.g. not sets for union, intersection, difference, subset?, and superset?), consider using the fungible library: https://github.com/jafingerhut/funjible
clojure.set/intersection appears to use the indexes of vectors as values. This results in very strange behavior if you accidentally end up passing a vector in as one of the arguments.
If any of the arguments are lists, you get a ClassCastException which is maybe a bit less clear than one would hope.
The same also happens if all arguments are lists: