Sized instance for Coll[T].
Sized instance for Coll[T].
Takes advantage of RType.isConstantSize to use ReplColl representation of Coll when all items are the same.
When all elements of T are of the same size, then only single Size[T] value is created and replicated
to the length of source collection xs
.
(Since version ) see corresponding Javadoc for more information.