Boolean values are those which are logically either TRUE or
FALSE. They are returned as result values by operators like
and and or, and accepted as arguments by operators like
if.
Following CommonLisp, muf does not have a separate Boolean type;
instead, it has a special value nil which represents FALSE,
all other values being taken as representing TRUE in a boolean
context. The standard true value is the constant t, but any
other value, such as 12 or .lib.muf, will do as well.
The constant nil also represents the empty list. See section Lists.
Note: In Muq v -1.0.0, nil and t are actually a separate
type boolean, as required by the Scheme standard. Programs should not
be coded to depend on this: The CommonLisp standard requires nil
and t to be symbols, and future Muq releases will switch to this
setup.
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