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| ANSI Common Lisp 4 Types and Classes 4.4 Dictionary of Types and Classes
4.4.2 boolean | Type
Supertypes: boolean, symbol, t Description: The type boolean contains the symbols t and nil, which represent true and false, respectively. See Also: t (constant variable), nil (constant variable), if, not, complement Notes: Conditional operations, such as if, permit the use of generalized booleans, not just booleans; any non-nil value, not just t, counts as true for a generalized boolean. However, as a matter of convention, the symbol t is considered the canonical value to use even for a generalized boolean when no better choice presents itself. Allegro CL Implementation Details: None.

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