Sounds quite good. Yes, I think this would be useful. I don't really have good answers to the other two questions.

In reply to Re: RFC: Set::Select: get intersection or union of sets; or more generally, the set of elements that are in one or more input sets by Laurent_R
in thread RFC: Set::Select: get intersection or union of sets; or more generally, the set of elements that are in one or more input sets by kikuchiyo

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