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      true, false, null and nothing Embedded Constants

      The boolean constant false is equal to a zero numeric value, a zero floating value and case insensitive strings "null", "false" and "off".

      The boolean constant true is equal to a non-zero numeric value, a floating non-zero value and case insensitive strings "true" and "on".

      The value null is equal to a numeric zero value, a floating zero value and case insensitive strings "null", "false" and "off".

      The value nothing represents a special incomparable type that can be used only with the assignment operation and two types of compassion: equal and not equal.