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Is there a way to use collectors to filter a list into a set?

there's no `filter` collector right now, although it should be possible to write it (right now, maybe using `reduce` ?)

And how does that go into a set? The docs don't really go into very much about all this...

<https://apidocs.arrow-kt.io/arrow-collectors/arrow.collectors/-collectors/set.html|https://apidocs.arrow-kt.io/arrow-collectors/arrow.collectors/-collectors/set.html> should help you

Use reduce and initialize it with an empty set