3 - Test writing beyond the end of a mapped-simple-stream
5 - Test write-octets / read-octets handling of encapsulated streams
7 - handle ansi-streams in write-octets / read-octets
9 - Implement socket-base-simple-stream and chunked transfer encoding.
11 - Implement / test string streams.
13 - Make sure the code examples for stream encapsulation from Franz work
15 - Test every single output function
17 - Handle character position (slot charpos)
19 - make file-position work for non-file streams, where applicable
21 - make pathname work for simple-streams