#Emacs: I use a snapshot build, which is generally solid but does occasionally change things. Recently I've noticed that my helm completions (mostly M-x and recent buffers) had duplicates, but I never got around to debugging why. Now I don't need to! https://tech.toryanderson.com/2020/08/24/helm-duplicates-history/
(Don't want to click; set the new-in-27.1 variable history-delete-duplicates to t)
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