Boolean := Object clone.
True := Boolean clone.
False := Boolean clone.
Nil := Object clone.
The Boolean object models values which represent truth-hood or falsehood. Its two subobjects, the true object and the false object, represent these two concepts, respectively, of truth-hood and falsehood. They are primarily used in Boolean statements such as if-statements and loop conditionals.
The nil object models the concept of emptiness. The nil object is also iterable and will always be viewed as an empty collection.
Boolean toString := "Boolean".
False toString := "False".
False toBool := False.
False false? := True.
True toString := "True".
True true? := True.
Nil toString := "Nil".
Nil toBool := False.
Nil nil? := True.
Nil iterator.Returns a NilIterator which iterates over
the empty collection.
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