PagedSeq isn't a monad

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PagedSeq's documentation promises that x.map(f) will return a PagedSeq, but in fact it defers to immutable.IndexedSeq's builder and thus ends up a Vector. This is tolerable behavior, but the documentation should reflect the actual behavior. Oddly, drop gives a Vector while slice gives a PagedSeq.

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Imported From: https://issues.scala-lang.org/browse/SI-8623?orig=1
Reporter: @Ichoran
Affected Versions: 2.11.0

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@kanielc said:
What is your suggested fix? Just update the documentation and leave the behaviour? or change the behaviour? (i.e. give it its own builder)

I'm guessing any non-documentation change would be based against 2.12.x

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@Ichoran said:
My suggested fix is to make it work properly, i.e. give it its own builder.

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@SethTisue said:
PagedSeq was deprecated in Scala 2.12 and will be removed in Scala 2.13.

It still exists though — it has been copied to the scala-parser-combinators library; see scala/scala-parser-combinators#97 . So if this is still a concern, you could open an issue or PR in that repository.

We would accept a documentation change for 2.12.x, but regardless, I'm going to close this ticket.