3 ms·True and false work fine as singleton subclasses of the abstract class Boolean; see Smalltalk.by gnaritas 14y agoTrue and false work fine as singleton subclasses of the abstract class Boolean; see Smalltalk.tomp 14y agoWhat prevents me from making a third subclass, Undetermined? ADTs and enums are meant to prevent this.gnaritas 14y ago> What prevents me from making a third subclass, Undetermined? Smalltalk isn't about preventing things, it's about enabling them.