ode>)</code></dt><dt><code>(blob-s8-set! </code><var>blob</var> <var>k</var> <var>byte</var><code>)</code></dt><dd><p><var>K</var> must be a valid index of <var>blob</var>.</p><p><code>Blob-u8-set!</code> stores <var>octet</var> in element <var>k</var> of <var>blob</var>.</p><p><var>Byte</var>, must be an exact integer in the interval {-128, ..., 127}. <code>Blob-u8-set!</code> stores the two's complement representation  of <var>byte</var> in element <var>k</var> of <var>blob</var>.</p><p>The return values 