(Changed in version 2.8.0) Set.map now returns a Set, so it will discard duplicate values.
(Changed in version 2.9.0) The behavior of scanRight
has changed. The previous behavior can be reproduced with scanRight.reverse.
(Changed in version 2.9.0) transpose
throws an IllegalArgumentException
if collections are not uniformly sized.
Represents an immutable linked hash set.