One of the blips in the performance charts seem...

One of the blips in the performance charts seems to implicate some
changes I made with slice to reduce the number of implementations and
surface area for inconsistencies and bugs. Altering those changes in a
more performance-mindful way, although I don't see anything here which
is likely to help much. Also fixing some wrong documentation about
copyToArray. No review.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/library/scala/collection/SeqViewLike.scala b/src/library/scala/collection/SeqViewLike.scala
index f79baa7c58..77dc15e695 100644
--- a/src/library/scala/collection/SeqViewLike.scala
+++ b/src/library/scala/collection/SeqViewLike.scala
@@ -93,6 +93,10 @@ trait SeqViewLike[+A,
   } with Patched[B]
   protected def newPrepended[B >: A](elem: B): Transformed[B] = new { protected[this] val fst = elem } with Prepended[B]
 
+  // see comment in IterableViewLike.
+  protected override def newTaken(n: Int): Transformed[A] = newSliced(SliceInterval(0, n))
+  protected override def newDropped(n: Int): Transformed[A] = newSliced(SliceInterval(n, Int.MaxValue))
+
   override def reverse: This = newReversed.asInstanceOf[This]
 
   override def patch[B >: A, That](from: Int, patch: GenSeq[B], replaced: Int)(implicit bf: CanBuildFrom[This, B, That]): That = {