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    $\begingroup$ wondering if Pick might be slightly more readable here. $\endgroup$ Commented Jan 6, 2021 at 1:24
  • $\begingroup$ @AccidentalFourierTransform It is probably just a matter of taste, but I think I prefer the Select form over something like Pick[tup1, keep /@ tup1]. $\endgroup$ Commented Jan 6, 2021 at 3:32
  • $\begingroup$ Sure, it is definitely a matter of taste. My point was that Pick together with a minor modification of keep might be ever so slightly cleaner/more readable. Or using the third argument. Or, being optimistic, perhaps there is a way to avoid having to define keep altogether. But I'm really just thinking out loud so don't take me too seriously :-) $\endgroup$ Commented Jan 6, 2021 at 12:48
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    $\begingroup$ +1. It might be worth mentioning that DeleteDuplicates with explicit predicate uses quadratic complexity algorithm based on pairwise comparisons, which explains the timing difference, as well as the existence of DeleteDuplicatesBy as a separate function. $\endgroup$ Commented Jan 7, 2021 at 2:26
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    $\begingroup$ I have added the new section How It Works. (also @LeonidShifrin) $\endgroup$ Commented Jan 8, 2021 at 12:32