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add documentation for Data.List.permutations

(low priority) I was wondering about Data.List.permutations. In its current form, it neither has API doc, nor source code comments.

I found that it has a very interesting backstory https://www.imn.htwk-leipzig.de/~waldmann/etc/data-list-permutations/

Could we add

  • something about "maximally lazy" to the haddock text
  • some historic (mailing list or GHC issue) reference, as a comment in the source

You could assign to me, and I'll make a proposal when I get to it.

I'm not sure - does this need to go through CLC? It's just adding comments.

Edited by jwaldmann
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