Here's a style question: If you have to conditionally do one set of side 
effects or another set, is your preference to use when and when-not, or an 
if containing do blocks? Or perhaps some other construct?

In terms of a concrete example:

(let [boolean-value (some-predicate?)]
  (when boolean-value
    (do-alpha)
    (do-beta))
  (when-not boolean-value
    (do-gamma)
    (do-delta)))

or:

(if (some-predicate?)
  (do
    (do-alpha)
    (do-beta))
  (do
    (do-gamma)
    (do-delta)))

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