I learned recently <http://stackoverflow.com/a/15332367/802383> that you can tell the reader to evaluate a function at read time, if you want some potentially costly operation that you know will result in a constant value to be done just once, rather than every time the surrounding form is evaluated, by prefixing it with the reader macro #= and I found this surprising. Shouldn’t this be documented in the Reader reference <http://clojure.org/reference/reader>?
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