'From Squeak3.1alpha of 28 February 2001 [latest update: #4188] on 9 July 2001 at 3:36:18 pm'! "Change Set: OopsSetFix-tk Date: 9 July 2001 Author: Ted Kaehler My previous addition of #species to Set caused bad things to happen. Dictionary select: did not return a Dictionary. This undoes that change."! !Set methodsFor: 'testing'! = aSet (aSet isKindOf: Set) ifFalse: [^ false]. self size = aSet size ifFalse: [^ false]. self do: [:each | (aSet includes: each) ifFalse: [^ false]]. ^ true! ! Set removeSelector: #species!