These are homogeneous vectors of small integers (0 <= i <= 255).
The functions that operate on them are analogous to those for vectors.
They are in the structure byte-vectors.
(byte-vector? value) -> boolean
(make-byte-vector k fill) -> byte-vector
(byte-vector i ...) -> byte-vector
(byte-vector-length byte-vector) -> integer
(byte-vector-ref byte-vector k) -> integer
(byte-vector-set! byte-vector k i)
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