I understand that sets or hash maps are more efficient structures for
lookups. However, in certain cases (especially if I'm programming
something interactively), I have either short lists or data which is
naturally a list that will be faster to walk through than to convert
it to a set (which implicitly assumes I'll walk through it). Anyway,
point taken, but I'm not sure that completely addresses the question
I'm posing.

On Jan 29, 3:23 pm, Achim Passen <achim.pas...@gmail.com> wrote:
> My guess is that the omission of includes? in core is not an oversight  
> after all, but an incentive to pick the right data structure for the  
> task at hand.
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