 stored in the buffer,
   but shrinks back to <code class="code">n</code> characters when <code class="code">reset</code> is called.
   For best performance, <code class="code">n</code> should be of the same order of magnitude
   as the number of characters that are expected to be stored in
   the buffer (for instance, 80 for a buffer that holds one output
   line).  Nothing bad will happen if the buffer grows beyond that
   limit, however. In doubt, take <code class="code">n&nbsp;=&nbsp;16</code> for insta