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<h2 class="chapter">10 Extensible Streams</h2>
<p>SBCL supports various extensions of ANSI Common Lisp streams.
<dl>
<dt><strong>Bivalent Streams</strong><dd>A type of stream that can read and write both <code>character</code> and
<code>(unsigned-byte 8)</code> values.
<br><dt><strong>Gray Streams</strong><dd>User-overloadable CLOS classes whose instances can be used as Lisp
streams (e.g. passed as the first argument to <code>format</code>).
<br><dt><strong>Simple Streams</strong><dd>The bundled contrib module <dfn>sb-simple-streams</dfn> implements a subset
of the Franz Allegro simple-streams proposal.
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