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Add :call? false option for types that do not implement ifn
#16
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I have no idea if you'd actually want this PR, but I figured I'd share it with you in case anybody else ever does.
In summary, I wanted to test a type that was like 90% Clojure's collections, but doesn't implement IFn. An example of something like this in Clojure is tagged-literal, which offers lookup via
:tagand:form, but does not implement IFn. For me, I wanted to be able to have an object that behaved like a function, but with some map-like metadata. It's sorta a goofy use case, hence you may not want this.