Changes

Summary

1. Abstract collections should redefine #isAbstract (details)

Commit 55425f3b4127163202764cb326afe009e138e940 by astares Abstract collections should redefine #isAbstract fixes #3086
	src/Collections-Abstract/Collection.class.st (diff)
	src/Collections-Abstract/HashedCollection.class.st (diff)
	src/Collections-Abstract/ArrayedCollection.class.st (diff)
	src/Collections-Abstract/SequenceableCollection.class.st (diff)