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(elisp)Bool-Vector Type

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Bool-Vector Type
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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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