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Maps and sets (and the sorted versions) are not indexed, so it makes no sense to call nth on them. However, sometimes you want to pick a random element from those collections and you don't want to transform them to a vector (or something similar) which is a linear operation - mostly you don't even need the vector. I don't know if it possible on the technical side, but it would be nice to have it.

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I don't think we're going to add that, but happy to leave it here to see if there's interest via votes.