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9 Extensible Streams

SBCL supports various extensions of ANSI Common Lisp streams.

Bivalent Streams
A type of stream that can read and write both character and (unsigned-byte 8) values.
Gray Streams
User-overloadable CLOS classes whose instances can be used as Lisp streams (e.g. passed as the first argument to format).
Simple Streams
The bundled contrib module sb-simple-streams implements a subset of the Franz Allegro simple-streams proposal.