Idiomatic if defines both branches. when returns nil in the else branch.
Examples:
; bad (if (some-func) :a nil)
; good (when (some-func) :a)
Idiomatic `if` defines both branches. `when` returns `nil` in the else branch. Examples: ; bad (if (some-func) :a nil) ; good (when (some-func) :a)
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