3 - Implement & test read-sequence, write-sequence for (un)signed-8 vectors
5 - Eliminate consing in sc-read-chars-ef
7 - Make reader work with simple-streams
9 - external format handling: load aliases, load formats, etc.
11 - Handle writing beyond the end of a mapped-simple-stream properly
13 - handle device-file-position for mapped streams
15 - Test write-octets / read-octets handling of encapsulated streams
17 - handle ansi-streams in write-octets / read-octets?
19 - Implement socket-base-simple-stream and chunked transfer encoding.
21 - Test string streams.
23 - Make sure the code examples for stream encapsulation from Franz work
25 - Test every single output function
27 - Test character position (slot charpos)
29 - make pathname work for simple-streams
31 - test :abort argument to close (should revert to original file)