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@@ -88,6 +88,11 @@ The type @emph{boolean} has two values, @false and @true.
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Both @nil and @false make a condition false;
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they are collectively called @def{false values}.
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Any other value makes a condition true.
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+Despite its name,
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+@false is frequently used as an alternative to @nil,
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+with the key difference that @false behaves
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+like a regular value in a table,
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+while a @nil in a table represents an absent key.
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The type @emph{number} represents both
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integer numbers and real (floating-point) numbers,
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