0.9.0

This release improves performance and compatibility with 2.12 collections.

It supports the following targets:

Target	Versions
Scala	2.12.x and 2.13.0-M2
Scala.js	0.6.x
Dotty	0.6.x

Performance improvements

• #278 Specialize Array collections (ArrayBuilder, ImmutableArray and WrappedArray)
• #332 Override toXxx operations when they are a no-op
• #340 Make knownSize non final on Iterator
• #343 Don’t force view elements prematurely
• #348 Optimize reverseIterator in IndexedSeq

2.12-compatibility improvements

• #334 Add IntMap, LongMap and AnyRefMap
• #346 Various bug fixes, additional methods and deprecated forwarders
• #351 Add WrappedString
• #352 Create a scalafix rule to migrate a 2.12 code base to a 2.13 code base using the new collections
• #355 Add immutable.Map#transform operation
• #358 Add collection.BitSet factory object, StringOps#updated, LazyList#append
• #364 Add MapOps#collect and IterableOnce#toIterator
• #369 Add Cloneable trait

Bug fixes

• #370 Fix ListBuffer#clear operation
• #371 Add implicit Factory and BuildFrom instances for Array[?] and String

Other changes

• #329 Rename unordered to unsorted
• #337 Rename Growable#add to addOne and Shrinkable#subtract to subtractOne
• #373 Add @implicitNotFound annotation to BuildFrom