Document PUA code points used by old decoders for old CJK(V?) encodings, as normalizing PUA artifacts is as important as Unicode normalization. Most of the problem should arise in Chinese and Han Nom characters, as there are more characters to screw up.
What if we write something that automatically generates bad jokes by substituting random words in a Wikipedia article for some boring:INPUT → funny:OUTPUT analogies? Word vectors can do that pretty well.
Special:Search/"bundled in GNU coreutils" -POSIX: is part of the [[X/Open]] Portability Guide since issue 2 of 1987. It was inherited into the first version of POSIX and the [[Single Unix Specification]].<ref>{{man|cu|df|SUS}}</ref> It first appeared in <ref>{{man|1|df|FreeBSD}}</ref>