AlienWeakTable sends #copyGrownBy: to both of its internal arrays, but it looks like neither Squeak nor Pharo implement it in the collection hierarchy. Pharo has #grownBy:, but Squeak doesn't. So in Alien-Core- kdt.59, I implemented SequenceableCollection>>copyGrownBy: by copying in the Pharo implementation of #grownBy:. This should solve some nastiness that could happen when the table hit its initial maximum (1024 objects). -- Ken Treis Miriam Technologies, Inc.