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A bool-vector is a one-dimensional array of elements that
must be t or nil.
The printed representation of a bool-vector is like a string, except
that it begins with `#&' followed by the length. The string
constant that follows actually specifies the contents of the bool-vector
as a bitmap--each "character" in the string contains 8 bits, which
specify the next 8 elements of the bool-vector (1 stands for t,
and 0 for nil). The least significant bits of the character
correspond to the lowest indices in the bool-vector. If the length is not a
multiple of 8, the printed representation shows extra elements, but
these extras really make no difference.
(make-bool-vector 3 t)
=> #&3"\007"
(make-bool-vector 3 nil)
=> #&3"\0"
;; These are equal since only the first 3 bits are used.
(equal #&3"\377" #&3"\007")
=> t
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